Marathon training primarily recruits which type of fibers?

answer:

Early on in a marathon, runners use mainly slow-twitch and a few fast-twitch IIa fibers. As the race goes on and muscle glycogen is depleted, however, more fast-twitch IIa fibers are needed to maintain muscle force

Explanation:

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answer:

The answer is few fast-twitch fibers. Hope it helps

take a break move to stretching and slowly work back into physically exercising if the problem continues go to a doctor or physical therapist