This Tour de France champion swears by Zone 2 training, but making it work for the Average Joe is not so simple

If you’re a cycling nerd like me, or perhaps into running or other endurance sports, you’ve probably come across the concept of Zone 2 training.

The idea has exploded in the past couple of years, with countless YouTube videos and articles written about the benefits of low-intensity training.

Put simply, Zone 2 is the metabolic state where you burn the most fat to power your exercise. It’s also a zone where it’s easy enough to exercise for a long time without blowing up.

The Zone 2 idea is that low-intensity training should make up the bulk of your training volume and by doing this you’ll increase your overall cardiovascular fitness without having to smash yourself.

It’s in direct contrast to the concept of high-intensity training and interval training, which were all the rage for a time, particularly for time-poor people. The idea being that short, sharp, high-intensity sessions could make up your entire fitness regime.

One of the biggest proponents of Zone 2 is Inigo San Millan, a professor in Colorado University’s Department of Family Medicine, who specialises in physiology, metabolism, mitochondria and cancer research.

Dr San Millan is the director of performance with UAE Team Emirates, the cycling team of two-time Tour de France winner Tadej Pogačar.

Dr San Millan says Pogačar will spend about 80 per cent of training at Zone 2 and he says that should be the same for all of us.

What exactly is Zone 2, how does it work, and just how easy is it?

In order to answer that question I subjected myself to an experiment.

My guide is Antony Stadnyk, a lecturer at the School of Sport, Exercise, and Rehabilitation at the University of Technology Sydney, and a former physiologist with the New South Wales Institute of Sport’s cycling program.

David Mark on a stationary bike, completing Zone 2 testing at the University of Technology Sydney.(Supplied)

“So this is what we for a long time have called the aerobic endurance training zone,” Dr Stadnyk says.

“It’s got this fancy new name, Zone 2, but it’s basically the top end of the low-intensity training zone.

“So it should feel easy, you should be able to have a conversation, but towards the top end, that’s when you’ll start to lose that ability and need to talk in shorter sentences or a couple of sentences before taking a breath of air.

“Zone 2 and our base conditioning, the aerobic base conditioning, is really the foundation of all our training.”

Dr Stadnyk and I are talking after he’s performed a series of tests on me to determine my metabolic thresholds and VO2 Max.

We did the tests in October last year.

My experiment is to commit to an extended block of training – the bulk of it in Zone 2 – to see if I get fitter and build my endurance.

I need a goal, so I’ve committed to riding in the Snowy Classic – a Gran Fondo in the Snowy Mountains in March.

There’s a 170-kilometre version, which I think is going to be a stretch too far for me – this year at least – so I’m doing the 107km loop from Jindabyne, which takes in around 1,500 metres of climbing.

Back to the tests — I’m at UTS with my bike on a stationary trainer wearing a heart rate monitor.

Dr Stadnyk’s strapped a mask over my head to capture the amount of oxygen I’m breathing in and carbon dioxide I’m exhaling.

After a warm-up, he asks me to ride for three minutes at a particular power output – which is measured in watts.

Dr Stadnyk is capturing all my data in real-time and has made a small pin-prick in my ear to collect a blood sample to measure my lactate levels as I go.

Then I’m off and pedalling. Dr Stadnyk starts me off at a leisurely 80 watts and then every three minutes he asks me to increase my wattage by 20. Each time I go up in power, he takes a blood sample to measure my lactate.

It’s pretty easy at first of course, but after 24 minutes I’m at 220 watts and my heart’s beating at 153 beats per minute (bpm) – about 91 per cent of my maximum heart rate.

I could go for a bit longer, but Dr Stadnyk now has enough information to determine my various metabolic zones.

And for the data nerds out there, this is what a moderately fit and slightly overweight 56-year-old is pumping out.

Time (minutes)

Power (watts)

Heart rate (bpm)

Lactate (millimole/litre)

3

80

102

0.5

6

100

107

0.6

9

121

112

1.0

12

140

120

1.0

15

162

130

1.5

18

180

139

2.4

21

199

147

4.0

24

221

153

5.8

Two-minute

max effort

322 (265)

169

9.9

After I take a breather, I warm up again for an all-out three-minute effort, which Dr Stadnyk is going to use to determine my VO2 peak and maximum heart rate.

At least it was meant to be a three-minute effort, but I made the mistake of going out far too hard and then had to hold on for dear life, while Dr Stadnyk quickly recalibrated it to a two-minute effort.

I’ve recorded an average wattage of 322 but he warned I should be cautious about the wattage because it was only a two-minute effort – which meant it was mainly anaerobic. He estimated that I would have averaged around 265 watts if I continued for another minute. Next time around I’ll go for a more paced three-minute effort and expect a lower mark.

But at least now he has the numbers. My VO2 peak was 45.6 and my maximum heart rate was 169bpm. I’m hoping that at the end of my training block, the VO2 peak, at least, will be higher.

Dr Stadnyk determined that my Zone 2 is somewhere between 115-130bpm or between 130-160 watts.

Ideally, we’d be using power as a metric during my rides, but I don’t have a power meter on my bike, so I’m going on heart rate alone.

He came to those numbers by looking at both my lactate and ventilatory responses. You can see that above 120bpm and 140 watts, my lactate levels jumped from one millimole per litre (mM) to 1.5mM. There’s another big jump after 130bpm and 162 watts to 2.4mM.

ABC journalist David Mark's data from Zone 2 testing

ABC journalist David Mark’s data from Zone 2 testing.(Supplied)

This graph shows that while my heart rate steadily increased in a straight line with my wattage output, the amount of lactate I was producing increased slowly and then started shooting up at that 162 watts mark – an indicator that I’m starting to burn more carbohydrate and less fat.

So, what exactly are we talking about with all this lactate, heart rate and zone stuff?

Remember that during Zone 2 we’re in the metabolic state where we are burning the most fat to fuel our oxygen.

“So, what we have is free fatty acids floating around the body, in the blood,” Dr Stadnyk says.

Those fatty acids are converted by the mitochondria in our cells into Adenosine triphosphate or ATP.

“ATP is what our body uses to produce the actual muscle contractions and physiological processes that we need to sustain life,” Dr Stadnyk says.

Now, at Zone 2 and below, our exercise intensity is such that the mitochondria can keep pace with our energy demands – burning fat consistently to keep powering our exercise.

Dr Stadnyk explains that when we consistently exercise in Zone 2, over time we get an increase in the number of mitochondria, which means our bodies become more efficient and have a greater capacity to oxidise fat for fuel.

We’ve been talking a bit about mitochondria, so Dr Stadnyk is taking us back to school:

“Probably back in high school, you’ve heard of mitochondria referred to as the powerhouse of the cell — that is absolutely true,” he says.

“So the greater density and number of mitochondria that we have, the sort of fitter and healthier the system is.”

A scientist stands next to a data screens, smiling for the camera

Dr Antony Stadnyk from the University of Technology Sydney, going through Zone 2 testing.(Supplied)

So to summarise: As we train more in Zone 2, we produce more mitochondria, which means we have a greater ability to metabolise fats.

As we become more oxidatively powerful, our bodies can use fat for longer and put off using carbohydrates as a fuel source, saving those stores for when we really need it during high-intensity efforts.

So in theory, the lactate curve in the graph above should shift to the right as I become fitter, but that can only last so long once we start to increase the exercise intensity Dr Stadnyk explains:

“While fats are really energy dense, they can’t be oxidised at a rate that is fast enough to maintain that exercise,” he says.

“The top end of Zone 2 is what we call the first metabolic threshold — you might hear that referred to as lactate threshold one, or the ventilatory threshold one.

“And that represents the point where we start to have an increase in energy being provided by carbohydrates, which provide less energy [per unit], but can be oxidised at a faster rate.

“And so with that, we start to get an increased production of lactate.”

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How rest and preparation dictate AFL performance

Sometimes truths in the sporting world are whispered quietly, and sometimes they are said aloud.

This week Craig McRae didn’t mince his words when on FoxFooty’s AFL360.

“There’s no way that you could look at the draw and say it’s fair anywhere. Everyone understands it. It’s just ‘which bit is yours (your advantage)’. That’s reality, isn’t it?”

For much of football’s long and storied history, the time of football was largely constant — Saturday afternoon.

The first midweek matches for premiership points happened in the league’s first season in 1897 on the date of the Queen’s Diamond Jubilee. Public holidays were the main reasons for the early weekday games in the early decades.

This regular schedule made it easy to follow your team every week, aside from knowing what ground a game was being played at.

This significantly helped players in the semi-professional era when they still had day jobs.

After experimentation with midweek, and night-time football, media executives and the VFL started to experiment more with the fixturing of proper league games.

In 1980 regular standalone Sunday afternoon games were introduced via games held at the SCG. Playing in Sydney provided the VFL a convenient end-run around the VFA’s government-backed grip on Sunday fixturing.

Friday night footy, pioneered in 1983 by the Swans is now perhaps the most commercially coveted fixture available.

Friday was the last weekday to feature a league game, but has since become a core part of the footy week. By the late 1980s all teams were regularly playing footy on Fridays.

Thanks to roaming public holidays and invented occasions like Anzac Day Eve, no day of the week is fully off-limits.

In the 2024 AFL season football will be played on at least six of the seven days of the week across 21 different start times.

The introduction of all these time slots has introduced new considerations for footy staffers — condensed and elongated preparations. This season sees more short breaks than ever before. These include five and six-day turnarounds — think Sunday to Friday being two games in six days. They also include multiple six-day turnarounds and batches of condensed games.

This is how teams prepare for the short week, and the impact it has on your team’s chances.

The footballing week

To work out how a short week can affect the preparation of a team going into a game, a better idea of a normal footballing week is required.

Richard Little, a former Essendon staffer and current data intelligence manager at the Victorian Institute of Sport, is across how clubs usually prepare for a week of football.

“Depending on the club, a seven-day break schedule would potentially look something like this:”

“Some clubs flip the sessions three days prior to the game with the ones two days out.”

Little stresses that this is dependent on the game and training loads before that week and the week’s scheduled ahead.

“Because the fixture is known for the first 15 rounds, these loads will have been planned well in advance,” Little adds.

“The skill acquisition aspect of training is generally planned loosely with specific drills dropped into a template as needed. So, it might be that a three or four week block is focused on defence but other areas would still be included. This is dependant on the coaching philosophy but it could be that there’s more work done on maintaining strengths or fixing weaknesses.”

Earlier this season Collingwood struggled with their performance coming off consecutive six-day breaks.

“Well we started the season with six days (break), six days (break), six days (break). We didn’t realise parts of our game were so far off,” McRae explained.

“So when you actually get a deeper breath you get to work on those things. You get to train some habits and change those focus areas.”

This ability to adjust on the fly is key to football clubs being able to right the ship midway through the season. It’s often why teams struggle to adjust the game plans on a wholesale basis until the bye rounds.

Shorter time frames between the games also mean the ideal schedule is adjusted.

“A compressed schedule is going to mean lighter training loads overall as the games themselves will provide the majority of the physical load,” Little articulates.

“On a six-day break, one of the post sessions will likely be merged with another and the main session will have reduced load. On a five-day break, individual craft or recovery skills are likely dropped and the main session is drastically reduced. Sometimes that’s only a couple of drills in those situations.”

Surprisingly, shorter breaks on their own don’t have a direct impact on game results. Emerging football analyst Emlyn Breese of CreditToDuBois.com has researched how these short breaks have affected results in recent years.

“It’s hard to identify the performance impacts of a short break in isolation. The typical things you’d look at as indicators of effort and energy like tackles and pressure acts — teams aren’t performing noticeably below their season average off a short break,” Breese told ABC Sport this week.

Breese has analysed outcomes against predicted performance based on how strong a team is expected to perform. He has used the predicted match results as calculated by James Day, creator of the blog Plus Six One and co-creator of the football statistics package FitzRoy as a baseline.

“When a side has two days less rest than their opponent they are likely to perform just under a goal worse than expectation when they are the home team, and about half that when they are the away team. They’re not big numbers on the surface, but when you’re looking at hundreds or thousands of results it suggests there’s something there.”

There’s also more extreme breaks — often caused by byes. Usually they have minimal impacts, with one exception.

“Teams coming off a bye playing away against a home side without a bye have performed, on average, a goal below expectation. Coaches talk all the time about just how hard it is to win a game of footy — I think it’s an example of the cumulative effect of just one more thing that takes the team out of their normal routine.”

It must be wearing off

It’s not only one match of short turnarounds that matters. Often teams have several shorter breaks compounding on each other – especially when compared to their opponents.

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‘Their voices are too high pitched’: The backlash Tracey Holmes faced as the first woman to host ABC Grandstand

Tracey Holmes might have been the first woman to host the iconic ABC radio sports program Grandstand but don’t call her a trailblazer.

“I’ve never thought of myself as that,” she says.

“My mum and dad were both pro surfers at the beginning of pro surfing and were exactly the same and I’ve never, ever liked that kind of distinguishing between one or the other, when it’s actually got nothing to do with gender, it’s a job and anyone should be able to do that job. It’s about the best person for the job.

“People talk now about ‘you can’t be what you can’t see’, and I don’t actually subscribe to that because I think you’ve got to look for where you can see yourself, even if there’s no one like you doing it.”

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Starting at the ABC in 1989, Holmes says she just modelled herself on the best in the business and, at the time, they were overwhelmingly men.

“Before me there was only men, all the national sports programs in Australia had only ever had men, and they were really good men doing that job. I learned a lot from them,” she says.

“I used to listen to them, and I’d look to men who were doing programs internationally and thought I’m going to be like that, or I don’t like that. It really should not matter what you are, male or female — and it does get on my goat that it does matter in some people’s eyes — you’re a human being. If you’re being discriminated against, fight that. But the whole thing about you can’t be what you can’t see, I think just look harder.”

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