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MAF Training review – Part 6 When You Need MAF

My previous articles about the MAF Method discourage using the age-related formula for low heartrate training. But in this post I’m taking a more positive angle because there’s a reason people went to Phil Maffetone and he was able to help them. So while, I’m not a fan of the age-related formula, I am a fan of building good endurance which relates to what Maffetone refers to as MAF – Maximum Aerobic Function. While I’m not going to advocate using his formula, I am going to detail and explain the circumstances where a block of endurance training could be useful.

A parkrunner I know is a very capable runner yet, in a decade of running, his progress has been very limited. In fact, he’s barely knocked a minute off his parkrun time. When we first met he’d been running again for perhaps six months. He’d been a talented youngster, quit and now returned to running as he approached forty. It hadn’t taken much training to achieve a twenty minute parkrun yet in all the running since he has barely scraped under nineteen minutes. Despite training five days per week, six at one stage, he really hasn’t made much progress.

His years of running have been blighted by Achilles’ problems. Whenever he starts to train harder with speedwork his Achilles becomes sore and limits his running. He then backs off the pace until long after the Achilles has healed, only to restart the speedwork and go through the same issues. Until recently he was able to run a 19:30 parkrun at full effort but over the last year he’s developed a hamstring injury and is struggling to break twenty minutes. On the tougher local courses, he can’t even break twenty-one minutes!

If he could go to Phil Maffetone, I’m sure MAF would get him back to health and restructure his training to help him improve. I’d still argue against using the age-related MAF formula because he’s over fifty and training at 125 (further five beat reduction for recent injury) isn’t going to produce decent longterm results. Yet, as you’ll see in the next section, he’s clearly not getting the aerobic development Maffetone would encourage and is running around almost every day of the week at heart-rates which are too high.

A typical week’s training when you need MAF

He typically runs five days per week – three midweek, a parkrun on Saturday which is always a faster effort, a Sunday run which is his longest of the week while the Wednesday run tends to be slightly shorter. He gives himself two rest days which, being on Monday and Friday, space the week’s training out nicely. All in it’s not a bad training structure to follow. Here’s the heart-rate graphs from those five days of training.

I’ve put a yellow line to indicate where a heart-rate of 150 occurs and you can see that on every run he is reaching and surpassing it for a decent portion of the time. In fact, at parkrun the heart-rate reaches 170+ and most days he’ll be hitting the 160s at some stage of the running. He’s not just exceeding 150bpm but exceeding it significantly on almost every run.

I consider the overall amount of time spent running each week to be an issue. Totalling about 25 miles per week in 3hr 20mins it’s not enough for a distance runner. Of course everybody leads different lives and has different priorities so I can’t be too critical. Yet at less than an hour the Sunday run isn’t long enough and it should surely be possible to find more time for it. If he was an 800m runner, an hour might be long enough but he isn’t; he describes himself as a 5K / 10K runner. Apart from a couple of ten mile races and a half marathon; 10Ks have been the furthest distance raced in all these years. This overall lack of training volume is part of the problem.

The average pace for the week is 7:45/mile and the Wednesday run is the slowest at 8:11/mile. Given a parkrun time that is just breaking twenty minutes, Jack Daniels’ VDOT tables suggest Easy runs should be somewhere around 8:30/mile pace. So again, alongside the evidence of the high daily heart-rates, we’re getting an indication that there isn’t enough genuinely easy running taking place.

There’s two more problems these stats don’t reveal. On each of the training runs he stops to cross roads which give him one to three minutes recovery on any run. There’s over nine minutes of stops built into these runs. It may seem picky but anyone who has done distance training knows a break is refreshing. If you’re running anaerobically those breaks allow you to recharge the batteries and keep pushing (too) hard. Now you may argue it’s impossible not to stop but, with good timing and route choices it can be avoided. I often go weeks without needing to stop on any of my runs simply by running on roads with low levels of traffic, early in the morning and being flexible about when and where I cross roads. I will happily run an extra fifty paces up a road to let traffic die down before crossing it. But obviously do the safe thing.

The other unseen problem in these graphs is there’s some decent hills on the routes. He’s trying to maintain the same pace up and down them but that pushes the effort up which explain some of the higher heart-rates.

Graphing all those runs differently we can see the time spent in a MAF-HR zone of 130 or less; a middle zone of 131-150 which is usually safe for older runners to train at and a 150+ zone where the training effect is large but also takes time to recover from.

It’s clear he’s running hard five days per week with heart-rates hitting the 150+ mark. You would think the two rest days would be enough but they aren’t. What’s actually happening is the muscles are being trained anaerobically. The days after the rest days (Tuesday and Saturday) are faster runs because the muscles are refreshed but all that allows is for him to go out hard and reinforce the anaerobic training. There is no aerobic development. One of the benefits of day-in, day-out training is it leaves the legs somewhat fatigued to the point where they have to go slower and that helps the aerobic development.

The main consequences of this approach are that he’s getting injured and not improving.

What good training looks like

Injuries were the sort of thing Maffetone was happy to dive in and sort out. As I have stated repeatedly, I’m not a believer in the age-related formula but I am a believer in what Maffetone was trying to get his clients to do which is stay healthy and get faster by building an aerobic base through good endurance training.

My own training during this period saw me run nearly double the training our Needs MAF runner was managing. I was just shy of fifty miles taking 6hr 24mins yet we had the same average pace for the week at 7:45/mile. Despite all this extra mileage I’d been training every day for almost three years without illness or serious injury. While I picked up a couple of glute strains along the way (which came from trying too hard in speedwork) neither lasted more than a week and I was still able to run. While our parkrun times are similar, my base endurance is improving and I am positioning myself to go faster in the longterm.

You can see I run every day but only push harder on two days (Tuesday and Friday). There’s a few little glitches on my heart-rate monitor particularly Wednesday which highlights the problem of accuracy with heart-rate training but otherwise I’m comfortably well below 150HR on my recovery days. My Sunday long run sometimes scrapes into the red but the training effect I’m interested is in building endurance on those runs. Even a good ninety minute run is still only a hard, aerobic effort. Where the Needs MAF runner has to take two rest days every week, I’m getting out there and running on them too.

Another intriguing detail of our training weeks is that we accumulate the same amount of 150+ ‘red zone’ training time but my extra running accumulates time and fitness in the supporting zones while allowing the body to recover from the harder sessions. If I tried to run hard every day like he does, I’m sure I would be getting injured too.

We’re both fifty years old and Maffetone would like us to be doing all our training to a heart-rate of 130 or below. I don’t believe in that but I do total over an hour of my weekly running at this level and it’s usually in the first couple of miles of the runs while my body warms up. This is important – I’m listening to my body to get an indication of how it feels and whether I can push hard. Maffetone talks about doing warm-ups in his book but the people who think he’s only about low heart-rate training miss this.

On days following a harder effort I find my legs don’t want to do too much and it is a struggle to get the heart-rate up. My legs can be glycogen-depleted so I just jog along to aid recovery. If I tried, I could probably push to higher levels especially if I’d had a day off but I don’t try to push it every day and that was Maffetone’s message.

80-20 training

Much of Maffetone’s work occurred in the 80s and 90s when heart-rate monitors were still new. The science of exercise physiology has progressed a lot in recent years. What we now know, due to the work of Stephen Seiler, is that elite athletes tend to split their training into 80% below lactate threshold and 20% above it.

Throughout this post I’ve referenced a HR of 150bpm. Be careful – 150HR is not THE definitive value to use; it’s the data that was available to me. That the Needs MAF runner trains somewhere around this level most days shows it is probably somewhere around his own.

One hundred and fifty is close to where my lactate threshold heart-rate usually lies and I calculate I have a 76-24% split above and below it. That’s within the bounds of 80-20 training. On the other hand, the Needs MAF runner’s training split comes in at 54-46%. It begins to explain why he’s failing to make progress and getting injured when he starts to do even more intense work!

Arguably it may be wrong to use 150HR to split his training but it’s clear he’s training too hard every day because his body is letting him know through injuries and lack of progress. You can also see when he runs 30secs/mile slower on Wednesdays, he has lower heart-rate so it would be easy for him to include more genuinely easy-paced runs. Doing that, as Maffetone outlined is the key to staying healthy and injury-free.

Although I’ve been explaining all this using data you don’t need a heart-rate monitor to know whether your training is going well. Just a bit of common sense and listening to your body will tell you. When it creaks and groans it’s time to back off.

My six posts on MAF training are among the most detailed and honest articles about it on the internet and well worth reading. I’m trying to help runners get past the idea that training to a single number on a heart-rate monitor is the answer to all their problems. Good training involves scheduling the right mix of sessions at the right times. A block of endurance training like Maf suggests is just one part of what you need. My years of training and coaching allow me to know what to do and when to do it to help runners get fitter, faster and healthier. If you too would like me to help you then please contact me with details of your running and how you think I can help you.

Eleven Bay Run Half Marathons – a retrospective

This year was apparently the 39th running of the Bournemouth Bay runs. I did my first in 1996 but it was almost a decade before I got back to it. My sporting time back then was dominated by playing and coaching volleyball; as well as going to circuit training and just about any other sport that I could find to fill my time with.

In 1996, like the majority of runners in yesterday’s race, I did a couple of months’ worth of basic training registering 10-20 miles per week at most in my preparation. I’d run my first half marathon at Portsmouth a month before and, in the lead-up to that, my only training aim was to do the distance in training albeit at a slow pace. I recall running on the February 29 (leap year) from Bournemouth pier to Boscombe pier and back (I reckoned it was 3-miles – not bad given it’s actually 2.85!). Then from Bournemouth pier to Shore Road and back (6-miles estimate, actually 5.6) and then another run to and from Boscombe pier to take it out to twelve miles which with a bit of distance to and from the car parked up on the East Cliff gave me confidence I would manage the distance. Then I went to Poole Sports Centre and played a volleyball match. That’s how I rolled in those days, cram in as much sport and activity as possible. No thought or understanding for recovery or the impact of doing too much.

I didn’t worry about how fast I was running, it was all about completing it. It was a time when my legs were big and strong from all the volleyball jumping and on race day I felt I couldn’t run any faster. I now I understand I simply didn’t have the aerobic training required for a fast half marathon and that reflects in my average heart-rate being in the 170s during the 1996 race. I distinctly recall running along, feeling comfortable, chatting to the chap near me and saying my heart-rate was at 177bpm and him replying “That sounds a bit high”. I’d tend to agree with him now!!

YearTime (HH:MM:SS)RankPace (min/mile)Avg. HR
19961:50:3510th8:26170-175
20051:54:46Slowest8:45—
20061:49:559th8:23—
     
20101:38:304th7:31—
20121:31:08Fastest6:57160
20131:39:436th7:36159
20161:40:178th7:39157
20171:35:373rd7:18157
20181:39:547th7:37158
20191:39:345th7:35155
20221:33:432nd7:08153

By the time I ran in 2010, I’d given up the volleyball and while my legs were still big I was running more regularly yet rarely more than twenty miles per week. I’d run a 1hr16 ten mile race three weeks before and most of my lunchtime 6K training runs were all-out efforts with a long run on the weekend. That was a game changing race as I set off fast from the beginning where previously I’d always lagged back then enjoyed working my way through the field. When I ran 1hr38 I was somewhat elated to take over ten minutes off my previous best.

It was late 2011 when I started taking running seriously and building my aerobic base. So at this stage, I still had the strong legs and while I didn’t fully understand how to train, I was beginning to learn. It led to my fastest half marathon ever and two-plus minutes ahead of this year.

What strikes me about most of the intervening half marathons is they’re all grouped around the 1hr39 mark. This could be a coincidence but I don’t think so. I’m sure it’s some kind of indicator of my natural level when I’ve done some training but not too much. The halfs in 2013, 2016, 2018 were all coming back from injury during the month or so before.

The one recent outlier is 2017 (my 3rd fastest) when I had deliberately done lots of jogging in the two months preceding it (400+ miles) and less than fifteen total miles at race pace. The result was good but I paid for it in the following days with soreness lasting until Thursday. Even so when I’d recovered three weeks later, I found myself running a 2½-mile effort run at 6:30/mile – significantly faster than the 7min/mile pace I had been running it in the weeks before the half.

Comparing 2012 vs 2022

In 2012, the average heart-rate was 160bpm and I spent fifty-nine minutes above it, maxing at 170bpm! Compare that to yesterday where my max only touched 160 a couple of times. It’s clear my aerobic base is improving yet that isn’t the only part of the story even for a half marathon. I was able to run a faster half marathon in 2012 with a worse base but the faster speed wasn’t there. I’m fairly sure my legs didn’t have enough taper from all the training but had I done so, I might have been in record-breaking form.

The flipside to the heart-rates is when I look back at my early Bay runs, I didn’t have enough of an aerobic base to run these sort of times. The high heart-rates in the 170s demonstrate that. There’s some kind of balance to be found.

Mileage isn’t everything

Another point of interest when comparing my 2012 and 2022 runs are my training logs for the preceding weeks. In 2012, my average weekly mileage was 33½ – 39, 26, 30, 36, 39 and 32; which is about 50% less than what I did this year when I was averaging 50.

I seem to run much better off lower mileage – perhaps in part because it leaves less to recover from. In those days I would take at least one day – Friday – off each week; this year I’d been running every day for over two years until I rested the two days before the half marathon.

I’m increasingly conscious that while some bang on about doing high mileage – it is not the be-all and end-all of running success. And certainly not critical if all you’re interested in is a parkrun or 10K race. Get quick over the shorter distances and the mileage will naturally increase.

I‘m hopeful once my legs recover I will be in a position to surpass everything I did in 2012. Back then I spent the year running sub-20 every Saturday at parkrun and training hard to break nineteen minutes but it never quite happened until the end of the year – after I’d done a block of endurance training. I always knew endurance training was important but could never quite understand how, ten years on I do.

When endurance training works

I’ve written at length about MAF training, or more specifically, the ineffectiveness of low heart-rate training especially when linked to age. It seems to me that most people don’t understand what is meant when it’s said building endurance will help them get faster. I hope this post will be useful by giving an example of when it works and how it affects your runs.

In September 2017 I ran the Solent half marathon in 1hr36. I set off way too quickly – running the first quarter mile at about 6:20/mile pace and the first mile coming in at 6:41. After that it was a slide as my endurance failed me and I got slower by the mile. Around mile 9 the course turned up hill which made the slowdown even more pronounced until I managed a final effort to the finish line. Here’s a graph clearly showing the decline!

After a week of recovery running, I embarked on building my endurance using my own method which doesn’t involve having my watch beep at me to stay under a certain heart-rate. Following a simple schedule of one hour Steady endurance runs on Tuesday and Fridays with a long run on a Sunday, I slotted in recovery runs lasting up to an hour on the other days. This gave me a total of around eight weeks where I was hitting around 60 miles – with a peak of 69 in mid-November.

Over these eight weeks, I took only one rest day and yet my legs were always ready to run the key Steady and Long runs. Each run I marvelled at how well it went and doubted that I would be able to repeat it a few days later. Yet each run came up and I never felt too tired or got injured. I could barely believe how my legs kept churning out the miles.

I ran the half marathon on September 24th where the pace began at 6:41 and just got slower. Two months later, on November 29th, I ran along the seafront for nine miles and here’s what the splits looked like:

After a first mile at 7:14 where my body was still warming up, each subsequent mile came in at 7:01 or faster. Mile 4 was the fastest at 6:51 but I barely slowed down. The time for these nine miles was 1:02:48 (avg. pace 6:59/mile).

Compare that to the first nine miles of my half marathon which were 1:03:57 (avg. pace 7:06/mile). You might think there isn’t much of a difference but remember this was a training run, not a race. I was doing this sort of run every three days, not taking a recovery week after it.

Remember that by the ninth mile of the race I was down to 7:39; here I was still at 7:01. The gap would only have got wider – it’s very clear to see here.

I ran a hard parkrun three days later on December 2nd. My last one had been in mid-August when I clocked 20:29; this time it was 19:37 – almost a minute faster. On my Steady runs I was only hitting a fastest mile at around 6:50/mile, on parkrunday I was able to push harder and run at 6:15/mile even though I’d done no training at that level in months.

Mile 1Mile 2Mile 3Last 0.11
19 August06:1606:4306:4906:1020:29
02 December06:1306:1106:2305:3619:37
(Apologies for using mile splits on a 5k but it’s easier for reference against the other data)

At both parkruns I set off with a fast first mile of around 6:15 but, before the endurance training I slowed significantly in the second and third miles just like when I ran the half marathon. On the latter parkrun, the endurance training came to the fore and while I still set off quickly the decline by the 3rd mile was much less. I remember running that day and it feeling like I had a booster on top of the endurance runs I’d been doing – an extra 30-40secs/mile dug out for when I raced.

It’s clear I was able to get faster through endurance training.

While I never trained to heart-rate I will highlight that on Solent 1/2M I averaged 163bpm; while on my Steady run of Nov 29th I averaged 149bpm with a max of 158bpm. I certainly wasn’t pushing as hard in training as I did during the race.

On the Steady run, which was typical during this training block, I spent over fifty mins at heart-rates over 150bpm which demolishes the age-related MAF formula’s calculation that as a 46-year-old man I should have been training to a heart-rate below 134. I certainly felt no strain and there were no health consequences incurred from doing so.

The other thing to note is the benefit of the endurance work was only possible because I already had the speed. At parkrun in August my fastest mile was 6:16 and, at the half marathon it was 6:41. All the endurance training did was train the body to hold onto that existing speed for longer. This is the nature of the endurance training – faster times occur because you are more consistent in your mile splits; not because it digs out more speed. Throughout this period, I never went to the track or did any interval work; I just worked on endurance.

Short sprint – Non-endurance?

Pandemic over, a friend posted he’d taken part in his “first non-endurance race” in two years. I was stunned. This is someone who coaches and, as one of the faster runners, has others looking up to him.

My shock was because his race was a five miler and he’d taken over thirty minutes. That’s an event of endurance. Somewhere around 95% of the energy comes from aerobic sources. If you’re of a metric disposition, it’s a touch over 8K; lying somewhere between the 5K parkrun and 10K races.

I’m sure he referred to it as an event of non-endurance because it’s not a half-marathon or marathon which require a higher volume of training miles. I guess it’s partly because he’s regularly capable of running five or six miles in a training session that he thinks there’s no endurance involved.

But it reveals a huge misconception that many runners make because they don’t understand how important endurance is in distance racing. And by publicising his five mile race as non-endurance, he wasn’t pointing anyone to the correct ways to train.

Parkrun is an event of endurance but many think the fast pace of front runners is created by speed training. And to an extent it is. You have to be capable of running at five minutes per mile pace if you’re going to run a parkrun in sixteen minutes. You need some speed training to cover ground quickly.

But speed can only be sustained for 1-2 minutes before you begin to huff and puff. Running a bit slower than top end speed will allow you to last longer but it doesn’t actually build the body’s endurance mechanisms. I’m not going to go into the best ways to build endurance, but I guarantee running fast, gasping for breath and hoping to hang onto it is not the way to do it.

Deliberately building endurance is the key reason why so many people who’ve spent six months training for a marathon are stunned when they return to parkrun and run a PB. They can’t figure out how they can be faster through only doing slower miles.

But, for as long as people think of parkrun or the 10K as “non-endurance” it’s going to be impossible to reach their potential. By process of elimination, if they think of these distances as “non-endurance” then they will train for speed to get faster at them. It simply doesn’t work.

The closest events get to being “non-endurance” are the sprints (100m – 400m) which are trained for by concentrating on speed. Even then their coaches talk about speed endurance. Any event beyond the sprints, starting from the 800m, has a large aerobic component that is improved by working on endurance.