The marathon is a 26.2-mile-long, endurance running race. Successful marathon runners will benefit from having leg muscles with a relatively high amount of ________.

Question

Quizplus · Accepted Answer

Slow muscle fibers, also known as type I muscle fibers, are capable of sustaining activity for long periods of time without fatiguing quickly. This is important for marathon runners who must maintain a steady pace over a long distance. Fast muscle fibers (type II) are better suited for short bursts of power and speed, but are not as efficient for endurance activities like marathons. Intermediate, smooth, and cardiac muscle fibers are not relevant to this particular type of athletic activity.

The Marathon Is a 26