Rest until the next set can match the one you just did. On a heavy squat, deadlift or press, that is usually two to three minutes. On a machine compound, about two. On curls, raises and other isolation work, sixty to ninety seconds. If you are short of time, cut rest on the small exercises first and leave the big lifts alone.

What a short rest does to the next set

Rest decides how many reps you get on the set after it. A review of 35 studies found that with loads between 50% and 90% of your one-rep max, three to five minutes of rest let people complete more reps across several sets than shorter rests did [4].

The 2024 meta-analysis below suggests that lost volume is how short rest costs growth [1]. A rest that is too short removes reps you would otherwise have done.

What the 2024 meta-analysis found

The largest recent analysis pooled nine randomised studies that changed rest time and kept everything else the same [1]. Its conclusion is modest. It found a small benefit for muscle growth from resting longer than sixty seconds, and no clear extra benefit once rest went past about ninety seconds. The authors suggest the benefit comes through volume: longer rest means more reps on later sets, and the gain stops once you have recovered enough to repeat the set.

The evidence behind it is thin, nine studies with wide uncertainty in every estimate. Ninety seconds is also an average across exercises that tire you very differently. A leg press set of twelve and a cable curl set of twelve do not cost the same.

Where the sixty-second rule came from

The older advice was thirty to sixty seconds for muscle growth, on the grounds that short rest raised growth hormone and gave a stronger pump [4]. Training studies since then point the other way. One trial put 21 trained men on the same programme with either one or three minutes of rest [2]. After eight weeks, the three-minute group had gained more strength on the squat and bench press and more thickness in the front of the thigh.

An earlier review of six studies had already found that both short and long rests could build muscle, with a possible edge for longer rest in trained people [3]. The burn at the end of a short-rest session is real, and it is a poor measure of whether next month's numbers will go up.

Rest times by exercise

• Heavy compound lifts (squat, deadlift, bench press, overhead press, anything at five to eight reps): two to three minutes, and up to five when you are working close to your maximum. These tire your whole body and your grip, and the next set suffers first.
• Machine and supported compounds (leg press, chest press, rows, pulldowns): about two minutes.
• Isolation work (curls, lateral raises, leg extensions, calf raises): sixty to ninety seconds. Only one muscle is working, and it recovers quickly.
• Core and timed holds: about a minute.

Treat these as starting points. The test is the next set. If your reps fall by two or more at the same weight and effort, the rest was too short for that exercise.

When you are short of time

Rest makes up most of a strength session. Five exercises of three sets with three minutes between them is forty-five minutes of rest alone. You can save time without losing much:

• Cut rest on isolation work first. One small muscle recovers quickly, so the next set loses the least.
• Pair exercises that do not compete. Do a set of rows, then a set of presses, then rest. Each muscle still gets its full rest while you work the other.
• Drop a set rather than rushing all of them. Two good sets of a lift beat three sets where the third is two reps short.

Signs your rest is wrong

Too short: reps fall sharply from the first set to the last at the same weight, you are breathing too hard to brace before a heavy set, or the target RIR is impossible by set three.

Too long: you are cold before the next set, or a session that should take an hour is taking two because the phone came out between sets. Longer rest stops helping past a point [1], and a session you do not finish helps less.

How Agyl's rest timer works

In Agyl every movement in your plan carries its own rest time, and ticking a set starts it. A plan written by Agyl uses three minutes for the first compound lift of the day, two and a half for the compound lifts after it, two for supporting and single-side movements, ninety seconds for isolation work and a minute for core. You can change any of them in the plan editor, and add thirty seconds to a single rest from the timer itself when a set was harder than planned.

The timer saves the time it ends rather than counting down in the browser, so it is still right if you lock your phone or switch apps mid-rest. It plays a tone when the rest is over. An iPhone set to silent will not play it, and no web app can change that, so the timer is on screen as well.

Reps and RIR from the last session sit next to each set, so you can see whether today's set matched it. For how to judge the RIR part, see How many reps should you leave in reserve?