A person who excels at weight lifting but does NOT do well at running marathons probably has leg muscles containing a large percentage of ________ fibers.

Question

Quizplus · Accepted Answer

Fast-twitch fibers are used for quick and intense activities such as weight lifting, while slow-twitch fibers are used for endurance activities such as running marathons. Therefore, a person who excels at weight lifting but struggles with long-distance running likely has a larger percentage of fast-twitch fibers in their leg muscles.

A Person Who Excels at Weight Lifting but Does NOT