If you were running a marathon which type of muscle fibers would be most useful to you

Are needed by the body in large amounts in order to maintain good health

Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

What does fi stand for in the fitt-vp principle of exercise prescription?