A man at my gym owns a percussive massage gun, a foam roller, compression boots, a bag of magnesium flakes, and a subscription to a cryotherapy place in town. He also sleeps about five and a half hours a night and eats lunch at his desk in eleven minutes.
I like him enormously and I have never said any of this to him. But it’s a fairly perfect illustration of where we’ve ended up, which is that recovery has become a category of things you can buy, and in the process the actual mechanisms of recovery — which are free, boring and non-negotiable — have somehow been demoted to background assumptions.
The recovery industry is now enormous. Ten years ago the concept barely existed outside elite sport. Now there’s a shelf of it in every sports shop and a studio on every high street, and the marketing has done a very effective job of implying that these things are what recovery is, rather than optional garnish on top of it.
So it seems worth going through what the evidence actually supports, what’s pleasant but inert, and what might be quietly working against you.
First: what recovery actually is
Training doesn’t make you fitter. Training makes you temporarily worse — it causes damage, depletes fuel, and fatigues the nervous system. The improvement happens afterwards, during the repair, and the repair requires three things.
Sleep. This is where the overwhelming majority of adaptation happens, and it isn’t close. Growth hormone release, tissue repair, memory consolidation of movement patterns, restoration of the nervous system. There’s no supplement, device or protocol that substitutes for it, and no amount of gadgetry compensates for chronically not getting it.
Food, particularly protein. You cannot rebuild tissue out of nothing. Under-eating while training hard is one of the most common reasons people plateau, feel permanently exhausted, and pick up niggling injuries. Time, and the absence of more training. Adaptation needs a window where you’re not tearing things down again. This is why rest days and periodic easy weeks are part of the programme rather than a break from it.
That’s the whole foundation. If those three are in place, everything below is worth single-digit percentages. If they aren’t, everything below is decoration.Which is a slightly deflating thing to write, and precisely why nobody builds a business on it.
Cold water: the interesting one
Ice baths and cold plunges are the most fashionable item in the category and also the one where the evidence is most genuinely interesting — because it suggests they may be actively counterproductive for a large number of the people using them. Cold water immersion after training does appear to reduce soreness and perceived fatigue. That part holds up reasonably well. If you have a match tomorrow and you need to feel less wrecked, it plausibly helps.
But there’s a body of research suggesting that regular cold immersion immediately after resistance training blunts the muscle-building adaptations from that session. The proposed reason is that inflammation, which is what the cold is suppressing, is part of the signalling pathway that tells the muscle to grow. Turn down the alarm and you turn down the message.
So the cold plunge someone takes after lifting, specifically to enhance their gains, may be reducing them. That’s a genuinely counterintuitive finding and it isn’t fully settled — but it’s replicated enough that I’d take it seriously.The practical position most sensible people have landed on: if you’re training for strength or size, keep the cold well away from your sessions, or do it on rest days, or don’t bother. If you’re an athlete who needs to perform again tomorrow and adaptation isn’t today’s priority, it makes more sense.
And if you just like it — if the cold shower makes you feel alert and clear-headed and sets your day up — that’s a completely legitimate reason to do it, and I’d file it under mood rather than recovery. Just don’t confuse the two. Saunas: better than you’d think
Heat has a better evidence base than cold, oddly, and gets a fraction of the attention.
Observational data from Finland, where sauna use is near universal and therefore studiable, has found associations between frequent sauna use and lower cardiovascular mortality. That’s observational, so causation isn’t established and the healthy-user problem applies — people who sauna four times a week may differ in other ways. But it’s a large, consistent signal.
There’s also a plausible mechanism: heat exposure produces cardiovascular responses somewhat resembling moderate exercise, plus heat shock proteins involved in cellular repair. Some evidence suggests heat may support rather than blunt adaptation, in contrast to cold.Beyond that, it’s warm, it’s relaxing, it’s frequently social, and it seems to help people sleep. Those aren’t trivial benefits and they don’t require a mechanism to be worth having.
If I had to pick one modality from the whole category, it’d be this, and mostly because I’d still want to do it if it turned out to do nothing.Foam rollers, massage guns, and the myth of the knot These feel good. That’s genuine and it’s not nothing. What they don’t do is what the marketing implies.
Foam rolling reliably produces a short-term increase in range of motion — usually minutes to hours — without reducing strength, which makes it a decent warm-up tool. What it does not do is break down adhesions, release fascia, or physically remodel tissue. The forces required to meaningfully deform connective tissue are far beyond what a person can generate leaning on a cylinder. Whatever’s happening is almost certainly neurological: a change in how much tension the nervous system will tolerate in that area, not a structural change.
Same story for massage guns. Pleasant, temporarily loosening, probably useful before training, no evidence of the deep tissue effects claimed. “Knots” are worth a mention here because the concept is so widely accepted. There’s no strong evidence that palpable tender spots are actual mechanical knots in muscle, and no clear consensus on what they physically are. That doesn’t mean they aren’t real — the tenderness is real, and pressure often helps it. It means the explanation we’ve all internalised is probably wrong, which affects what you’d expect to fix them.
Use them if you like them. Don’t budget them as recovery.
Soreness is not the point, and isn’t what you think
While we’re here: two persistent myths.The soreness you feel a day or two after training is not caused by lactic acid. Lactate clears within about an hour of exercise. Delayed soreness appears to involve microscopic muscle damage and an inflammatory response, and the full mechanism is still debated. Anything sold on the basis of “flushing out lactic acid” is trading on physiology that was abandoned decades ago.
And soreness is a poor indicator of a good session. It mostly reflects novelty — a new movement, an unusual amount of lengthening under load, a longer session than usual. Well-trained people frequently aren’t sore at all, and are progressing perfectly well. Chasing soreness as a measure of quality will lead you toward exercise selection that’s novel rather than effective.
If you take one thing from this: stop using soreness as a scoreboard. Stretching, and what it’s for Static stretching does not appear to prevent injury in any convincing way, and it doesn’t meaningfully reduce delayed soreness either. Both of these are things nearly everyone was taught.
What it does do is increase range of motion, largely through improved tolerance rather than by lengthening tissue. If you want more range — for a sport, for a lift, for getting off the floor comfortably — stretching works for that, and it works best when combined with actually producing force in the new range rather than just hanging out there. Do it because you want to be able to move further. Not because it’s a prophylactic.
The rest of the shelf
Compression garments. Some evidence for a modest reduction in perceived soreness. Little for performance. Harmless, mildly useful, wildly overpriced. Cryotherapy chambers. The whole-body versions have thinner evidence than plain cold water and cost considerably more. If the cold theory above holds, the same adaptation caveat applies.
Magnesium salts in the bath. Absorption of magnesium through the skin at any meaningful level is not well supported. A hot bath is relaxing and that’s a real benefit. The salts are probably along for the ride.Active recovery. A light walk or easy cycle on a rest day does seem to help, and it’s free. This one I’d endorse without reservation.
