Range of motionROM

How far a joint or lift travels through its full available movement.

Range of motion is how far a joint can travel, measured in degrees. Passive range is how far it can be moved for you; active range is how far you can move it yourself, and the gap between the two is a strength and control problem rather than a flexibility one.

It matters for training because it determines how much of a movement you are actually training. Trained through a full range, a muscle develops across its whole length; trained through a partial range, it develops mostly where it was loaded, which is why half squats produce half the result and a bench press stopped short leaves a lot behind.

There is a hierarchy worth knowing. Full range generally produces at least as much growth as partial range and often more, particularly when the extra range is at the lengthened end where the muscle is stretched under load. Adding weight while quietly shortening the range is not progress.

It is not a virtue in itself, though. More range than you can control is a liability rather than an asset, and hypermobile joints need strength and stability work rather than more stretching. The target is a usable range you own with force.

It improves through two routes. Regular stretching increases range over weeks, and this is what stretching is genuinely good for. Strength training through a full range increases it too, often as effectively, with the advantage that the range you gain comes with control.

What it does not do is prevent injury by itself. The most cited injury prevention meta-analysis found favourable results for every measure it examined except stretching, and found strength training reduced sports injuries to under a third of the control rate.

In practice, load your lifts through the fullest range you can control, stretch if you want more range for its own sake, and stop treating flexibility work as insurance.

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