Full Range of Motion vs Partial Reps

Quarter squats with more weight look like a better deal than they are. A meta-analysis comparing full and partial range of motion found full ROM ahead for lower-limb hypertrophy (effect size 0.88) and for maximal strength (0.56) [1]. Differences in muscle architecture between the protocols were small.

This is one of the few technical variables where the direction is unambiguous. If you are choosing between 100 kg through a full range and 130 kg through half of it, the first option buys more size and more strength.

It is worth noting the advantage was clearest for the lower limbs — that is where the effect was largest and best documented. For the upper body the picture is less clear-cut, though the direction is the same.

Practically, that means you have the most to lose on squats, leg presses and lunges — precisely where range shortening is most common and easiest to hide under a bigger number.

Full range does not mean maximal joint flexion. It means the largest range in which you keep spinal position and control of the load. If your pelvis tucks below parallel in a squat, your full range ends above that point — not where the anatomy of the guy next to you ends.

That distinction has consequences for exercise selection. Rather than fighting for depth in a back squat with limited ankle mobility, it is more productive to pick a variation where a full controlled range is available — hack squat, Bulgarian split squat, or heels elevated.

Load7 swaps the exercise when the data shows range shortening systematically as load climbs, instead of only trimming the weight.

Policing range requires a reference that does not move week to week. The simplest is a physical marker: a box behind your heels in the squat, a board on the chest in the bench, a fixed step height on lunges. Without one, range shortens gradually and nobody notices — including you.

The second method is filming one working set every two weeks from the same spot. Comparing two clips a month apart catches range drift faster than any in-set sensation.

Partials added on top of full-range sets is a different question from replacing full range with them — and the meta-analysis above only answers the second [1]. Adding a few reps in the stretched position after your last full set is a reasonable, cheap practice.

Partials are also justified when full range is temporarily unavailable because of an injury. In that case they are a time-limited workaround, not a way to add 30 kg to the bar.

There is one more situation where a shortened range is justified: when full range in a given exercise loads a joint in a position that consistently hurts. Touching the chest with a painful shoulder is not a test of character; it is a repeatable provocation.

The fix, though, is usually a different exercise rather than a shorter range in the same one. Neutral-grip dumbbell pressing gives a full controlled range without that position — a choice that keeps both the range and the joint.