For beginners, stopping resistance exercises just before your muscles give out works just as well as pushing to complete failure for building muscle strength and size, whether you're lifting heavy or...

When untrained men lift weights until they can't do any more reps, they get more tired over time compared to stopping earlier, meaning their muscles wear out faster.

Whether you lift lighter weights or heavier weights until you can't do any more reps, both ways give you the same muscle growth and strength gains if you're already used to training.

Lifting weights until you can't lift anymore makes muscles grow bigger no matter how heavy the weights are, but using heavier weights builds more strength than lighter ones.

Lifting weights until you can't go further while your muscles are fully stretched probably builds more muscle than stopping when they're fully squeezed. This happens because stretching the muscle under load keeps more tension on it throughout the movement, especially in exercises like calf raises.

When young women lift weights until they can't anymore, they do more total work with lighter weights than heavier ones, but this extra work doesn't make their muscles grow any more, showing that just doing more reps isn't what makes lifting effective.