"Fast-twitch" refers to a type of muscle fiber that contracts quickly and powerfully, making it essential for activities that require short bursts of strength and speed. Athletes like sprinters and weightlifters rely heavily on these fibers to perform explosive movements. Fast-twitch fibers are less efficient at using oxygen, which means they tire out faster than their slow-twitch counterparts.
These muscle fibers are crucial for sports that involve quick, intense actions, such as football or basketball. Training methods like sprinting or heavy lifting can help develop fast-twitch muscles, enhancing an athlete's performance in their chosen sport.