When endurance athletes push themselves to exhaustion, their jumping ability gets worse in normal or low-oxygen air, but stays the same in hot conditions. This shows that different types of tiredness...

Breathing less oxygen while exercising hard makes endurance athletes tire out faster because it weakens their muscles' ability to work properly, but getting hot doesn't really change how their muscles perform.

If you're feeling more stressed, you might bounce back slower after a tough workout — like not jumping as high as usual for a few days — and it could be because stress affects your muscles or motivation.

Even when male college sprinters say they feel back to normal after a hard 400-meter race, their leg power is still down by over 7% the next day — meaning their muscles might not be fully recovered even if they feel fine.

When people who regularly lift weights push their muscles until they can't do any more reps, their ability to jump high drops more right after than if they stopped before getting tired. This means their muscles and nerves are more worn out.

If young adults feel more stressed, they might bounce back more slowly after a tough workout — especially when it comes to how high they can jump.