Rest between sets is easy to treat as dead time.
You lift, the set ends, and the training feels paused until the next one starts.
It is still part of the workout.
In strength training, rest decides how much quality you can bring back to the next set. Cut it short and the session becomes denser, more breathless, and more limited by fatigue. Let it run longer and you usually protect output, especially when the lifts are heavy or technical.
Neither choice is automatically better. They train slightly different things.
A 2018 systematic review on rest intervals and muscular strength looked at 23 studies with 491 participants. It found strong gains could still happen with short rests, but longer rests over two minutes seemed more useful for maximizing strength in resistance-trained people. For newer lifters, shorter to moderate rests were often enough.
You can feel this in the gym. If you rush squats, presses or pulls, the next set may be limited by lungs, grip, bracing or focus before the target muscles are ready. The set becomes harder, but not always better.
Hypertrophy is a little more flexible. A 2024 systematic review with Bayesian meta-analysis found muscle growth can happen across a wide range of rest intervals, with a small advantage leaning toward longer rests. That is useful because it removes the need to pretend there is one perfect timer for every exercise.
So choose rest by the job of the session.
If you are lifting heavy, learning a movement, or trying to keep reps clean, take enough time to make the next set honest. Two or three minutes is not wasted if it lets you move well and keep load where it belongs.
If you are doing accessory work, circuits, or a session built around density, shorter rests can make sense. Just know what you are trading: less recovery, more pressure, and usually lower output per set.
At MOTRA, this is how we think about effort: the work and the recovery both shape the session.
The timer is not there to make you look busy. It is there to help the set do what you chose it to do.