How long should you rest between sets? What the science actually says

The usual advice — “rest 2-3 minutes between sets” — treats rest as a single knob. It isn’t. What you need depends on what you just lifted, why you lifted it, and how you’re doing today.

Here’s what the research actually supports.

What the evidence says

• For strength, longer rest wins. A 2017 systematic review in Sports Medicine (Grgic et al., “Effects of Rest Interval Duration in Resistance Training on Measures of Muscular Strength”) found rest intervals of ≥2 minutes produced meaningfully greater strength gains than shorter ones in trained lifters.
• For hypertrophy, longer rest doesn’t hurt — and often helps. Schoenfeld et al. (2016, J Strength Cond Res, “Longer Interset Rest Periods Enhance Muscle Strength and Hypertrophy in Resistance-Trained Men”) compared 1-minute vs 3-minute rest over 8 weeks in trained men. The 3-minute group saw greater gains in both strength and muscle thickness. The “short rest for the pump” idea hasn’t held up.
• For conditioning, rest is the prescription. Buchheit & Laursen (2013, Sports Medicine, “High-Intensity Interval Training, Solutions to the Programming Puzzle: Part I”) lays out how work:rest ratios are specific programming variables — short rest shifts the stimulus toward the cardiopulmonary system, longer rest keeps efforts high-quality and more neuromuscular. If your intervals say 90 seconds off, that number is the training stimulus.

Most people under-rest on heavy work.

How to apply it

• Max strength (1-5 reps, heavy): 3-5 minutes. You should feel sharp, not just less winded.
• Hypertrophy (6-12 reps, near failure): around 2 minutes. Longer if set quality is dropping.
• Accessories (small muscles, lower load): 60-90 seconds. You’re not systemically fatigued.
• Intervals / conditioning: follow the clock exactly.

The part the clock doesn’t know

Same person, same lift, same weight — the right rest still shifts with sleep, yesterday’s session, time of day, and where you are in your programme. A fixed beeper can’t see any of that.

That’s why the Doggins rest timer counts up rather than down, with an honest cap. The clock is a guide; you’re the one in your body. That’s the programme we’re building.