Why Does Coach Ray Get Me To Train So Slowly?

As the goal of most people’s training is to improve, to get faster, to go further, to perform better, it is only natural that you want to push your training. To push the pace, to increase the effort to strive for improvement.

Intensity in your training is only natural and as your fitness improves it is only natural that you try to push the pace. With each session it is a natural assumption that if you travel further or take less time to cover the distance then therefore you have improved.

What is the purpose of training? I believe it is to improve. How do we measure that improvement?

It is easy to accept the obvious data that can appear in front of you with each training session. But if we ignore this obvious data from each training session we can focus on the aim of particular sessions and ensure that the aim is achieved.

Although this article could be written for any endurance athlete I shall focus on running, but the principles apply to both cycling and swimming (as well as rowing, kayaking etc…)

There are a number of reasons why I get my athletes to focus their intensity on the lower intensities.

If we look at the training of many elite athletes, we know that elite athletes conduct a  number of quality training sessions at high intensity. When we look at the social media of any elite athlete it doesn’t take long to find a boast about the hard/challenging sessions they complete.

Talk with any athlete friend and they too will boast about the tough sessions they have achieved (often with some exaggeration) or by contrast they will deny they have even been training, but psychological games aside the focus is on training harder faster and/or longer.

When we turn the attention back to the elite athletes research has shown us what they actually do and the vast majority of their training is at lower intensities. In fact about 80% of their training is conducted at the lower intensities. Why is this?

In Matt Fitzgerald’s book 80/20 Running he talks about a runner he coaches called Juan Carlos who is wanting to improve from a 10km time of 52:30.  In an email to Matt Fitzgerald he complains “I can barely run 8:45 per mile [~5:30 min/km] pace any more“. Matt replies to Juan explaining he has no business running 8:45 per mile except in specific moderate intensity runs, which provide little value to his training plan and that a more appropriate pace of 9:30 per mile [~6:00 min/km] for most sessions, which he advised should make up four out of every five runs conducted. I often find myself giving similar advice to a number of my athletes and putting the brakes on the intensity athletes are training at. Note that this is the training intensity and not the racing intensity, which is where the success of the training programme or plan is actually measured.

A lot of Fitzgerald’s book talks about research by Stephen Seiler who has devoted his scientific career to analysing training of endurance athletes. He has researched the training methods of a range of athletes and not limited to swimmers, cyclists or runners and also included cross country skiers and rowers. Overwhelmingly Seiler and scientific colleagues who have researched training habits of the best endurance athletes provide evidence that they conduct about 80% of their training at lower intensities.

Across all endurance sports Seiler (and other researchers) were able to assess (through Heart Rate data) how much training is done at different intensities by different athletes. The key constant is that across ALL endurance sports the top athletes all spend roughly 80% of their training at lower intensities. Some studies defined low intensity differently from others, but they are all minor or subtle differences.

Although 20% of their training is done at higher intensities, and there is no dispute it is this higher intensity work that is what makes athletes faster, it is the lower intensity work that facilitates the success of the high intensity training. Without the low intensity training, the high intensity training WILL NOT deliver your greatest fitness improvement. You need to build your aerobic base first to make the most of the speed sessions.

Aerobic Base

To enable you to develop your speed for your event, it is important to have an aerobic base. Building this aerobic base and enhancing it as much as possible ensures your speed work delivers the greatest benefit to your running (or cycling etc…).

The aerobic base will ensure your heart and lungs work together efficiently to take oxygen out of the air and then deliver it to the working muscles where it is needed to drive biochemical processes within the muscle fibres. It involves a number of steps in the process and if we can optimise each step in this process through our training, when it comes time for the higher intensity sessions you can reap greater gains.

Arthur Lydiard was a coach often associated with lots of long runs.  Stories of the legendary 20 miler runs in the Waitakere ranges in New Zealand are those he would send his 800m runners like Peter Snell on. These runs are an essential part of building Peter Snell’s (amongst others) aerobic base where the other aspects of Arthur Lydiard’s training could deliver the goods (and plenty of gold medals) as a result. It is often not discussed about Arthur Lydiard’s training but he was a big proponent of high intensity training, but only for key sessions. In his book Healthy intelligent Training about training using Lydiard Principles Keith Livingstone explains “There is a time and place for everything.”

As you build your aerobic base your lungs get better at taking oxygen from the air and diffusing it across into the bloodstream. The heart also makes changes and develops larger chambers – to pump more blood with each beat, a more muscular left ventricle (the chamber that then pumps blood to the entire body) – in order to pump the blood more forcefully so it gets to the limbs with a reasonable amount of pressure.

Both Livingstone, as well as Martin & Coe in their book Better Training for Distance Runners describe physiological changes that occur at Endurance building intensities. Slow twitch fibre development, increased blood volume, increased connective tissue development, increased muscle fuel storage, increased oxidative/glycolytic enzymes and increased capillarisation all occur. Although you might find all these technical words overwhelming, trust me they are all advantageous improvements for an endurance athlete to get. When intensity is higher, you lose a number of those benefits as they don’t occur as the body makes other physiological adaptations.

In a recent interview with Leroy de Beer a running coach from PT Central he talks about having patience and building your aerobic base so you can then get the benefit when it is time to include intervals and speed work into your training.

What is the intensity you need to train at?

Livingstone describes aerobic running as using oxygen at an effort level where the amount (or volume) of oxygen inhaled is comfortably enough to supply the demands for the exercise you are doing. You can maintain this intensity for many minutes or hours in a fit athlete. At slower intensities body fats, as fatty acids are used to fuel the exercise. The more intense the exercise more carbohydrates are used as fuel.

Martin & Coe (who interestingly is four time olympic gold medalist Sebastian Coe’s father) are more precise with their determination of exercise intensity. Between 2 & 3.5 mmol blood lactate is the intensity that will illicit the positive physiologically changes. They go on to describe the fact that Aerobic conditioning represents the largest percentage of a distance runner’s training.

They describe Endurance intensities as the base of a training pyramid (which Livingstone also refers to). The base of this pyramid forms the foundation of any endurance training programme.

In 80/20 Running Matt Fitzgerald defines intensity to develop the endurance system as needing to be a minimum of 60% of maximum Heart Rate (HR). In another of his books, The Runner’s Edge, he describes Pace Zone 3 as corresponding to 65 to 75% of your VO2 max (this is the pace zone I get my athletes to use to develop their base fitness). He goes onto explain that running at this intensity increases resistance to injury, advances running economy, as well as the better endurance and increased aerobic capacity.

The other key reference I base my training philosphies about is the process of Jack Daniels’ PhD VDOT system. Similar to Matt Fitzgerald’s system Jack Daniel’s starts off with determining your capability either through races or time trials. With close alignment with Matt Fitzgerald, what Jack Daniels calls Easy Running is to be done between 59 & 74% VO2 max and indicates that this is about 65 – 78% maximum Heart Rate (HR).

As you can see there are a number of different, but closely aligned guides to intensity from different sources, however they all end up pretty close to each other. The benefits don’t simply stop because you are 1 Bpm too high or 5 sec per kilometre too quick. But the benefits decrease the more you stray from the scheduled zones. There is no precise start and stop point but a blending from one zone to the next.

So What if I Train Too Fast? I Want To Run Fast Anyway.

At the end of the day if you don’t want to follow my advice or try and beat science it’s not going to impact your enjoyment of running. But if you are wanting to optimise your performance the only successful way to go for the long term is to build an aerobic base first. To do so you need to maximise your time at appropriate intensities.

The other thing that occurs from running too fast is that you will take longer to recover from the session.  In a recent interview with Jaime Stevenson a Multi-Day Ultra Running Coach, she explains how with her Number 1 Training Tip she does emphasise the easy days within her programmes to ensure that her athletes are as fresh as possible for the days when she wants her athletes to run hard.


Why Do You Struggle To Train Slow?

Most people feel most comfortable running a pace that is familiar with them and physically have difficulty running slow if they haven’t done much slow running lately. Matt Fitzgerald suggests that if a runner was to go for a run without a watch they would settle into a pace very close to the pace at which they did on their last easy run (and the one before that…..).

When you train at an intensity that is high, this habitual intensity is hindering your progress. It feels natural, as your stride has become familiar through experience.


To ensure you get the most out of your training you need to build an endurance base first. This is most effectively done by running at lower intensities (but not so low that you are walking).

If you would like further advice feel free to contact me.

I am the Head Coach & Director of Qwik Kiwi – Endurance Sports Consultant.

I specialise in assisting first timers and recreational athletes to achieve their sporting goals. I can be contacted at and 021 348 729.

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If you enjoyed this article here is one I wrote about on of my clients and how things went wrong when they tried catching up sessions they had missed.

What Mick Learned By Not Sticking To The Programme


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