This study didn't check how hard you work out, how close you get to max effort, or which exercises you pick — so we can't say for sure how those things affect muscle growth or 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.

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.

A lot of workout studies don’t have enough participants to notice small but real muscle gains in people who already lift weights, so their results might be confusing or wrong.

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.

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.