Do Partial Reps Build More Muscle? The Science Explained – RP Strength

For decades, the golden rule of bodybuilding has been “always use a full range of motion.” If you were caught doing half-reps, you were accused of ego lifting. But recent sports science is turning that old-school advice on its head.

Dr. Milo Wolf, who dedicated his PhD to studying range of motion (ROM) and muscle hypertrophy, sat down with the RP Strength podcast to discuss his findings. The definitive answer? Yes, partial reps can build more muscle than full range of motion—but only if you do them in a very specific way.

When Dr. Wolf began his research, he fully expected to prove that full range of motion was the undisputed champion of muscle growth. But when his team analyzed all the available studies, they found a massive difference based on where the partial rep was performed.

The data was incredibly consistent: maximizing tension while the muscle fibers are fully stretched is the most powerful trigger for growth.

You don’t need to completely abandon full range of motion to benefit from this science. Dr. Wolf outlines three practical ways to integrate this research into your training, depending on your experience level:

If you just go all the way down and all the way up, you are still going to get about 90% of the maximum muscle-building benefits. For beginners or those who want to keep things simple, full ROM is a foolproof way to ensure you hit the stretch without overcomplicating your workout.

This is the sweet spot for most lifters. Perform your exercise with a full range of motion until you can no longer complete a full rep. Instead of racking the weight, stay at the bottom of the movement (the hardest part) and pulse out a few extra half-reps in the stretched position. You get the functional strength of full ROM and the extreme growth stimulus of the stretch.