Guides · 5 min read
Rep speed: why the same weight moving faster means you're stronger
Lift a weight as hard as you can and it moves at a certain speed. Get stronger, and the same weight moves faster, even when you can't yet add a plate. Coaches have used this idea for years under the name velocity-based training.
Why speed shows progress early
Strength gains don't arrive in 5 kg steps. They build a little at a time. On a weight stack you can't see that until it's enough to finish another rep or move the pin. Speed fills the gap: if every rep at 30 kg is quicker than it was two weeks ago, something is improving.
Speed also drops as you tire
Within a set, each rep usually gets slower as fatigue builds. The last reps before failure are the slowest. That's useful in two ways:
- A set where speed barely dropped was probably far from your limit.
- A set where speed fell a lot was close to failure, even if you didn't stop there.
How to compare fairly
Speed only means something when everything else matches. Compare:
- the same machine, set up the same way;
- the same weight;
- the same rep in the set (rep 3 against rep 3, not rep 3 against rep 9);
- the same intent: lifting the weight up with purpose, under control.
If you change any of those, the comparison isn't like for like. A different machine, a new seat height or a slow tempo set will change the speed for reasons that have nothing to do with strength.
What not to do
Don't chase speed by bouncing the weight, cutting the range short or yanking the cable. Faster reps only count when they're the same rep, done the same way.
General information about training, not medical or personalised advice. If you have an injury or a health condition, check with a doctor or physiotherapist first.