I’m not taking rest days any more, and I don’t think you should either.
For many, myself included, taking a day off is harder than the workout itself.
If you're someone who feels guilty when you're not training, always looking for an opportunity to squeeze in an extra run, another gym session or "just a quick workout", you're not alone.
It often comes from a good place: you enjoy training, you want to improve, you believe that doing more will get you there faster.
But what if that's exactly what's slowing your progress?
Maybe we've been thinking about these days the wrong way.
Instead of calling them recovery days, what if we started calling them adaptation days?
Because recovery isn't actually the goal; adaptation is.
Take today - I woke up feeling good, my body feels rested, energy is high. I’m keen to train, and on the surface, it seems like there’s no reason not to. But today is a rest day on my program, so I’m staying put.
That’s because the only thing standing between me and lacing up for a run I'm not supposed to be doing is focusing on the idea that today is for adaptation, rather than rest.
Something is happening today, even though it doesn’t feel like it.
Matt, my coach, has actually had me training like this for a few weeks now, programming a little less than I’d normally choose for myself and making sure I have multiple full rest days during the week.
And, surprise, it’s working.
My fitness is improving, resting heart rate is the lowest it’s ever been, my HRV is climbing, I’m lifting heavier, and I don’t get to the end of a week and find myself glued to the sofa all day because the week’s training has caught up with me.
So let's look at what the body is actually doing on a day like today, because understanding why you need to leave space for adaptations makes it a lot easier to do.
Training Doesn’t Make You Fitter
This sounds counterintuitive, but training itself doesn't make you stronger, faster or fitter. Training is simply a stressor.
Your training sessions sit within a simple equation:
Stress + Adaptation = Progress
Take away the stress, and there's no reason for your body to change. Take away the adaptation, and all you've done is accumulate fatigue. Both are essential.
It means that the goal isn't to train as much as possible; it's to find the right balance between challenging your body and giving it enough time to respond.
Think of it like a bank account.
Each workout is a withdrawal. It takes something out of you. Every workout deliberately disrupts your body's normal state. It creates tiny amounts of muscle damage, depletes energy stores, challenges your cardiovascular system, taxes your nervous system and leaves you fatigued.
Adaptation is the deposit. It’s the rebuild that happens in the hours and days after the session where your body repays the withdrawal with interest.
Your body repairs the damage and rebuilds itself to better tolerate that same stress in the future. It’s saying "If I'm exposed to this again, I'd better be better prepared," and so it deposits a little more back in than you had to start with.
And this is what keeps the account balance growing over time.
But if you keep making withdrawals before the deposit arrives, eventually the balance heads in the wrong direction.
So What Is Actually Adapting?
Depending on the session, different parts of your body are getting to work.
- Your muscles repair and become stronger so they can produce more force next time.
- Your heart becomes more efficient, pumping more blood with each beat so it doesn't have to work as hard.
- Your mitochondria increase in number, improving your ability to produce energy aerobically.
- Your nervous system becomes better at coordinating movement and recruiting muscle fibres, which is one reason strength often improves before muscle size does.
- Your tendons and connective tissues slowly become stronger too, although they adapt much more slowly than muscles. That's one reason overdoing it can lead to niggles that seem to appear out of nowhere.
Every one of these adaptations takes time, which is exactly what today's adaptation day is making space for
Even if you can’t feel the mitochondria increasing in number - trust us, it’s happening!
How Much Time is Enough?
It depends on what you’ve asked your body to do. Generally, the higher the intensity, the more adaptation time you'll need.
A well-designed program puts the right things next to each other and leaves the right gaps in between.
That doesn't necessarily mean you need a rest day after every session. If you alternate between upper and lower body, keep training volume low enough to recover from, or vary the intensity so that not every workout is all-out, you may only need a couple of adaptation days each week.
The key is to give your hardest sessions the most space around them. As a general rule, if you're training four or five times a week with a couple of high-intensity sessions, an adaptation day every two or three training days is a good place to start.
Right now I'm trying to build strength, improve my fitness, and play social sport twice a week, so Matt's put my strength and interval sessions on the same day, which frees up the next day to be properly off. Once my sport season ends and my schedule changes, we’ll spread things out differently.
Why It’s Easy To Push Through
The signals you can actually feel - energy, mood, how fresh your legs are - come from systems that bounce back fast.
But muscle, tendons, joints and the deeper part of your nervous system continue adapting long after your energy levels have bounced back, and you don’t always have a clear signal of when you’re ready to go.
So it's entirely possible to feel fresh while parts of you still have repair and adaptation work to do.
That’s where it's easy to get caught out and train based on how you feel that day, not what your body actually needs over the week.
That’s why you have to trust the structure (and the coach!) more than the feeling.
What Happens When You Skip Recovery
Skipping your adaptation day doesn't usually cost you straight away.
Rather, the effects show up bit by bit with a little niggle that won't clear or sleep that's a bit worse than usual, or sessions you used to enjoy starting to feel like a slog.
Eventually, the training gets to a point where you can’t work hard enough to create enough stimulus, and you stop making progress.
Or something forces the break you kept avoiding, whether that’s burnout or an injury that stops you in your tracks.
Let it Compound
A program built for adaptation, not just stimulus, lets you train consistently for months, even years, rather than swinging between periods of overtraining and forced time off.
So stop thinking of these as days when nothing happens. They're the days your body quietly cashes the cheque your training wrote.
Leave the account alone long enough for it to grow.
And recognise that by doing nothing today, you're doing something.
TL;DR
(Too Long, Didn’t Read)
- If you find it hard to prioritise recovery, prioritise adaptation instead.
- You don't grow in the gym, you grow in the days after it
- Feeling fresh doesn't mean you're fully adapted; some of the work happens where you can't feel it
- Skip it too often, and the cost shows up later, not straight away
- A well-built week leaves space for this on purpose, so you don't have to rely on willpower to take the day off
For now, it’s your turn.
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