Sports
Muscle Dynamics in Sports
Quick fact
Your muscles contain a mix of fast-twitch and slow-twitch fibers; elite sprinters may have up to 80% fast-twitch fibers, while marathon runners have over 80% slow-twitch.
Why this is interesting
Ever wonder why a sprinter's legs burn after 100 meters while a marathon runner keeps going for hours? The answer lies in how your muscles dynamically switch between energy systems and fiber types.