How long to rest between sets: what the studies found, lift by lift

The rest timer is the dullest setting in a training log, and it decides how long a session takes. Five exercises, three sets each, three minutes between sets: that is about 40 minutes of rest. Halve the rest and the session loses about 20 minutes. Whether you lose anything else depends on the lift.

How long should you rest between sets?

In short: rest longer on the heavy lifts you do first, and on anything where your next set comes up well short of the last one. Rest less on small-muscle work, where shorter rest costs the fewest reps.

What does the research say about rest between sets?

The evidence has moved away from fixed prescriptions. Rest now looks like it matters mainly through the reps it lets you keep.

The 2016 trial is the one most often quoted, and it is a good one: trained men, 3 sets of 8-12 reps on seven exercises, three full-body sessions a week, and rest as the only difference between groups. Its limits are size and length. Twenty-one people over eight weeks can show a difference, but they cannot pin down a precise optimum.

The 2026 ACSM document is the newest and the most cautious. Where the 2009 stand gave specific minutes, the 2026 review gives no rest recommendation at all, because across the reviews it covered, rest length was not a significant factor for strength and the hypertrophy data were too thin to call (Currier et al., 2026).

Rest still matters, though less than effort and total volume, and mostly through its effect on volume.

Why does longer rest help, when it does?

It keeps reps on the later sets. Rest a minute between heavy sets and the second and third sets usually come up short of the first. Over weeks, that is less total work.

Longo et al. (2022) tested this directly. Twenty-eight people trained one leg at a time on knee extensions at 80% of one-rep max for ten weeks, with 1 or 3 minutes of rest and some protocols matched for total volume load. Quadriceps growth followed volume load: about 13% in the long-rest and volume-matched short-rest conditions, about 7% in the others. Strength rose similarly across all of them. The authors concluded that volume load drove the growth and the rest interval itself did not.

Singer and colleagues read their 2024 meta-analysis the same way: the benefit of resting past 60 seconds is probably mediated by smaller losses in volume load, and those losses level off as rest gets longer.

In practice, rest long enough that the next set is not cut short. If you rest less, for time or preference, add a set to make up the reps.

How do you shorten a workout without losing much?

1. Cut rest on isolation and machine work first. Curls, raises and leg extensions recover quickly between sets. Keep the longer rest on the first heavy compound lift of the day.
2. Pair opposing exercises. A 2025 meta-analysis in Sports Medicine found supersets cut session time while keeping total reps and volume load similar, with similar long-term strength and hypertrophy. Opposing pairs such as a row with a bench press kept volume best. Pairs with similar movements, such as bench press and dips, reduced it, and supersets in general felt harder and caused more fatigue.
3. Rest less and add a set. Longo’s volume-matched conditions show this works.

Should you time your rest at all?

I think so, though the reason has little to do with physiology. Any progression rule that moves on reps assumes the reps are comparable from one session to the next. If Tuesday’s sets had two minutes between them and Friday’s had four because you were on your phone, the rep counts in your log are measuring the rest as much as the lifting. That matters most under double progression, where the weight only goes up once every set reaches the top of the rep range.

A timer keeps that variable fixed, and it stops rest creeping the other way on days when you are in a hurry.

This is training information and not medical advice. If you have a heart condition or high blood pressure, or get dizzy during heavy sets, ask a clinician how to approach heavy lifting and rest.

How LiftLog times rest

LiftLog starts the rest timer when you log a working set. Warm-up sets don’t trigger it. The timer shows as a ring with the next set underneath, and has buttons to add or take off 15 seconds or skip the rest.

You pick your default rest in Settings, from 30 seconds to 5 minutes. Each exercise can carry its own rest instead: presets of 30 seconds, 1, 1.5, 2, 3, and 5 minutes, or a fine-tune between 10 and 600 seconds. That is enough to follow the table above, with long rest on the first heavy lift and short rest on the isolation work.

For supersets and giant sets, focus moves to the next exercise in the group after you log a set, so the logging screen follows the order you train in.

The timer keeps counting in the background. It ends with a sound and a haptic, each of which you can turn off, and it can send a “Rest complete” notification if you’ve left the app. Programs and progression rules are covered in choosing a strength program you will finish.