Teen girl gymnasts who train four times a week steadily get better at jumping power and handle landings more safely over a month, suggesting regular but not overloaded practice helps their bodies...

When young female gymnasts who train regularly add extra workouts for two weeks straight, they might lose some of their explosive jumping power compared to sticking to their normal routine.

When teenage girl gymnasts go from training 4 to 6 times a week for two weeks, their muscles and coordination get worse over time, especially in the second week — meaning piling on too much too fast might hurt their performance.

For young adults who exercise a bit, doing a quick 9-minute sprint workout leads to bigger drops in muscle power—like how high you can jump or how strong your legs and arms feel—compared to other similar workouts using burpees or steady hard exercise.