Which of the following is the primary benefit anaerobic exercise a. stronger bones b. flexability c. strength d. lower blood presure

C

Explanation:

Anaerobic exercise is intense exercise on the body that causes the muscle to form lactate because the energy demand can't be met by adequate oxygen supply for aerobic respiration in the muscle cells. This type of exercise is meant to increase muscle strength and power and is recommended for athletes who are keen to develop force rather than stamina (such as bodybuilders).

i think it's the first one because doctors aren't the ones who get rid of the old needles. most of them time it's not even doctors who give you shots, it's nurses.