muscle fiber composition

Muscle fiber composition refers to the types of fibers in a person's muscles, mainly categorized into two types: slow-twitch and fast-twitch. Slow-twitch fibers are endurance-oriented, providing sustained energy for activities like long-distance running—they are more resistant to fatigue. Fast-twitch fibers generate quick, powerful movements, ideal for sprinting or heavy lifting, but fatigue more quickly. An individual’s mix of these fibers influences their athletic ability, with some people naturally having more of one type. Training can somewhat influence fiber performance, but your overall fiber makeup is largely determined by genetics.