Twelve-year-old Jeremiah received his fitness results. He wants to improve his muscular strength over the next two months to achieve healthy fitness zone status. What should be the first action step he takes?

If you were running a marathon, which type of muscle fibers would be most useful to you? a. slow-twitch b. fast-twitch, type i a c. intermediate-twitch, type ii b d. slow-intermediate twitch, type i b select the best answer from the choices provided. a b c d