Stuart jogs with his brother each morning, and they are able to talk about their plans for the day in short bursts of conversation. which best describes their heart rates during this activity?
a. low
b. moderate
c. vigorous
d. dangerous

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