How many warm-up sets you actually need

Most lifters either skip warm-up sets entirely or do five of them out of habit. Neither is really based on anything. The honest answer is that warm-up sets exist to get your working sets to feel right, not to burn calories or tick a box, and the amount you need depends on how heavy you're about to lift.

What a warm-up set is actually for

There are two kinds of warming up. A general warm-up raises your body temperature, like a few minutes on a bike. A specific warm-up is doing the exercise itself with lighter weight before your real sets, so your body and brain rehearse the movement. For lifting, the specific kind is the one that matters. A review of training research found general warm-ups contribute little evidence to strength training performance, and advised restricting warm-up time to exercise-specific sets rather than general cardio or stretching.

One study on bench press and squat compared different warm-up setups before the real working sets. It found that a warm-up using a higher load, around 80% of the training weight, produced faster bar speed than a lighter 40% warm-up in the squat. A separate study on resistance-trained lifters found that a warm-up at 80% of working weight led to more total training volume than lighter 40% or 60% warm-ups in the session that followed. The pattern across this research points the same way: warming up closer to your working weight tends to prepare you better than warming up with very light weight.

How many you actually need

If your working weight is light or moderate, like a dumbbell row or a lat pulldown you could do for 15 reps, you probably don't need a dedicated warm-up set at all. Your first working set at a lighter relative load does the job on its own. The heavier and harder the lift, like a heavy squat, deadlift or bench press set near your limit, the more it helps to step up to it gradually.

1. 1

   Start light if the lift is heavy For a big compound lift, your first warm-up set can sit around half your working weight, for a handful of easy reps.

2. 2

   Step up in two or three jumps Move the weight up each set, dropping the reps as the load climbs, so the last warm-up set sits close to your working weight.

3. 3

   Stop before you're tired Each warm-up set should feel easy. The goal is to rehearse the movement and prime the muscle, not to pre-fatigue it.

4. 4

   Skip them for lighter work For moderate or light exercises, especially machines and isolation moves, one light warm-up set or none at all is usually enough.

Why this matters for progression

A warm-up set is not a working set. It shouldn't be loaded to the point of fatigue, and it shouldn't be where you judge how the exercise is going. The useful information, the reps you actually hit, the weight that felt hard, all comes from your working sets. Warm-ups just get you ready to do those well.

A warm-up set should get you ready for the real sets, not tire you out before them.

There's also a time cost to think about. Doing six warm-up sets before every exercise eats into your session for little extra benefit, especially on lighter lifts where your body is already warm from the exercise before. The same review on time-efficient training suggested prioritising specific warm-ups over general ones, and keeping stretching for when flexibility itself is the goal, as a way to train effectively without wasting time.

If a joint feels off during warm-up sets, or something hurts rather than just feeling heavy, that's worth getting checked by a qualified professional rather than working around it.