When you do the same weight workout more than once, your muscles get better at handling it — so next time, you’re less sore and damaged.

When people first do a new kind of workout, their muscles get sore and damaged, but after doing it again and again, their bodies get used to it and stop getting hurt — this study proved that exact thing.

The study had people do the same tough jumping exercise twice, two weeks apart, and found they got less sore and weaker the second time—proving that doing the same workout twice helps your muscles adapt and get hurt less. This matches the claim perfectly.

When people do the same tough workout twice, their muscles get less sore and damaged the second time — this study shows that’s true, even if the exact reason inside the muscle cells is a bit different than expected.

When a muscle is exercised hard once, it gets sore and damaged. But if you do the same exercise again later, it doesn’t get as damaged—the muscle learns to protect itself. This study shows that exact thing happened in rats, proving the idea works.