Doing partial reps after you can't finish a full rep might build muscle twice as fast per set compared to doing full reps, even if you're lifting the same total weight. It’s like squeezing more muscle growth out of each workout.

You can build the same amount of calf muscle by doing shorter, harder reps that go only partway up—instead of full reps—while doing about half as many sets. It’s like getting the same result with less work.

If you're a guy new to calf workouts, doing extra partial reps after hitting failure on full calf raises doesn’t give you more muscle growth — it’s just as good as sticking to full reps, and both methods boost calf size by about 8% in 10 weeks.

Doing full squats or full arm movements when lifting weights doesn’t necessarily make your thigh muscles grow bigger than doing partial movements—studies show both ways work about the same, so going all the way down or all the way up might not give you extra muscle gains.

Doing a full squat or starting a bicep curl from the bottom makes your muscles grow more at the far ends (like the top of your thigh or the outer part of your bicep) than doing partial reps from the top.

Even if you tweak your weightlifting routine—like lifting heavier, doing more reps, or resting longer—it won’t make your muscles grow bigger than a simple, steady progress plan, even if your body is making more muscle proteins.