A marathon runner would be using

Question

Quizplus · Accepted Answer

Marathon runners are endurance athletes who need to sustain their physical activity for long periods. This requires the use of slow-twitch muscle fibers, which are characterized by their ability to produce energy through aerobic pathways and sustain contractions for a longer time without fatigue. In contrast, fast-twitch muscle fibers, which specialize in producing quick bursts of energy through anaerobic pathways, are more suited for sprinting and high-intensity activities. Therefore, the answer is mostly slow muscle fibers.

A Marathon Runner Would Be Using