When doing leg presses, taking only 1 minute of rest between sets makes you breathe harder overall than taking 3 minutes, but this doesn’t happen when doing chest flys—your body handles short breaks better when using smaller muscles.

Right after leg presses with only 1-minute breaks, your body gasps for air more intensely in the first minute than if you took 3-minute breaks—but this doesn’t happen with chest flys.

How long you rest between sets doesn’t usually change how long your body keeps burning calories after a workout—unless you do chest flys with long breaks, then it stops sooner.

Even if you rest only 20 seconds between sets, you can still get just as strong as someone who rests 2 minutes—as long as you do the same total amount of lifting.

Doing leg presses burns way more calories than doing chest flys—even if you do the same number of reps—because your legs use more muscles and keep burning energy longer after you finish.

Even if you rest only 20 seconds between sets instead of 2 minutes, as long as you do the same total number of reps and weight, your muscles still grow and get just as strong.