If you’ve been lifting for a while, doing more workouts over time will help you build more muscle than just lifting heavier weights.

If you're already used to lifting weights, doing more sets and reps over time will help you build bigger muscles and get stronger — but only if you keep training consistently.

If you've never lifted weights before, your muscles grow bigger faster from training than someone who's been lifting for a while—even if you both lift the same amount of weight, because your muscles are more responsive when they're new to exercise.

People who’ve never lifted weights before gain muscle much faster than those who’ve trained before—even if they do the same workout.

People grow muscle at very different rates — but each person tends to grow their arms and legs similarly, no matter what weight they use. This means your genes and biology matter more than how heavy your weights are.

If you lift weights until you can’t do another rep, it doesn’t matter if you’re using light, medium, or heavy weights—you’ll still grow your muscles about the same, as long as you push yourself hard and do enough total work.