Doing light, steady exercise—like a brisk walk—can boost the energy powerhouses in your muscles.

For people who aren't super fit to start with, different types of workouts—like steady cardio, intense interval training, and short sprints—boost the energy powerhouses in their muscles by about the same amount, around 23–27%.

Doing short bursts of intense exercise can help your muscles make more proteins, especially the ones in energy factories inside cells, but it doesn’t always make your muscles bigger if you only do it for less than six weeks.

Doing steady, moderate exercise regularly might help your muscle cells' energy factories work better by boosting a protein that helps them merge and stay healthy.

Doing moderate, steady exercise like brisk walking or cycling for several weeks might boost the energy powerhouses in your leg muscles, which could help your body burn fuel better and improve overall health.

Sprint workouts might boost your muscle energy factories way faster per minute than other types of exercise — about 2-4 times more efficiently than harder or longer workouts, especially if you're just starting out or somewhat active.