Whether you're working your quads, calves, or biceps, stretching them fully during exercises helps them grow bigger — this works for many different muscles, not just one.

When you stretch your muscles fully during workouts, the ends of the muscles grow more than the middle parts — the stretch makes the muscle ends bulk up more than the center.

Even the middle parts of your muscles grow more when you stretch them fully during workouts — it’s not just the ends that benefit from full range of motion.

When you do strength exercises where your muscles are stretched the most (like lowering a weight fully), you build more muscle than when you only move partway through the motion, no matter which muscle you're working.

Working your biceps with your arms stretched back might grow the upper part of the muscle a bit more than doing curls with your arms already in front of you.

Even though muscles might grow a tiny bit more at the far end when stretched more, it’s so small that it doesn’t really matter in practice — all parts grow about the same.