Velocity based training uses how fast the bar moves to decide how heavy to go and when to stop. The appeal is simple: the bar does not care how you slept. Speed at a given load is an honest readout of what you have available today.
The core idea: load and velocity are linked
For any given lifter and lift, there is a near linear relationship between how heavy the bar is and how fast it moves. Light weights move fast, heavy weights move slowly, and the relationship is consistent enough to be predictive.
That has a useful consequence. If you know the speed at which your one rep max moves, you can work backwards: the velocity of today's warm up set tells you roughly what your max is today, before you attempt it.
Mean velocity versus peak velocity
Mean concentric velocity is the average speed of the bar through the whole lifting portion of the rep. It is the number most velocity targets refer to, and the one worth tracking for strength work.
Peak velocity is the fastest instantaneous speed reached during the rep. It is more relevant for explosive work like jumps and olympic pulls, where the top end speed is the point.
Rough velocity zones
These are commonly cited ranges for mean concentric velocity. Treat them as orientation, not law, because they vary meaningfully between lifts and between lifters:
- Above 1.0 m/s: speed and power work, light loads
- 0.75 to 1.0 m/s: strength speed, around 60 to 75 percent
- 0.5 to 0.75 m/s: heavy strength work, around 75 to 85 percent
- 0.3 to 0.5 m/s: maximal strength, 85 percent and up
- Below 0.3 m/s: grinding, at or near a true max
The squat, bench and deadlift all have different velocities at the same relative intensity, so build your own profile per lift rather than borrowing one.
Velocity loss as a stopping rule
This is where velocity based training earns its keep for most people. Rather than fixing the number of reps in advance, you stop the set when bar speed has dropped by a set percentage from your fastest rep.
A 20 percent velocity loss threshold is a common choice for strength work, and 10 percent for power work where the goal is quality rather than accumulated fatigue. The effect is that a good day gives you more reps and a bad day gives you fewer, automatically.
Measuring velocity without a dedicated device
Commercial linear position transducers and accelerometer units are accurate and expensive. Video based measurement derives velocity from the tracked bar position across frames instead, which is why frame rate matters so much: speed is distance over time, and more frames means a finer time base.
SetSync derives velocity from its bar path tracking, so a lift needs the bar tracked before speed numbers appear. Filming at 240fps gives a noticeably cleaner velocity trace than 120fps for fast lifts.
One honest caveat on any video method: it measures what the camera can see. A camera that is not square to the bar will under-read vertical speed, so the setup discipline matters more here than anywhere else.
Who it is worth it for
Velocity based training is most useful for intermediate and advanced lifters whose day to day readiness varies enough to matter, and for anyone peaking for a competition where overshooting a session is expensive.
If you are still adding weight to the bar every week, linear progression will serve you better than autoregulation. There is nothing to autoregulate yet.