Muscle size and strength don’t respond the same way to more training—strength peaks faster, so adding more sets helps muscle growth longer than it helps strength.

Doing more weightlifting gets you stronger, but after a certain point, extra sets don’t help much—way more than when you’re trying to build muscle size, where more work still gives you decent gains.

Training more often helps you get stronger, but doesn’t seem to help you get bigger muscles—so frequency matters more for strength than for size.

When you lift weights more often or heavier, your strength goes up fast at first but then slows down a lot quicker than your muscles growing — so strength gets tired of extra work sooner than muscle size does.

When you lift weights more often, your muscles get bigger at a steady pace even if you go really high volume, but your strength gains slow down much faster — meaning your body builds muscle and gets stronger in different ways.

Doing resistance training more often won’t make your muscles much bigger if you’re a young guy, but it will definitely help you get stronger.