<span>Whether or not exercise will assist an individual in maintaining optimum health will obviously depend on the type of exercise, and any medical conditions that they suffer from. The likely desired answer for this question, however, is that yes, exercise is necessary for optimal immune health.</span>
Probably the last one. It's the least realistic way to make your body healthy. If you are going to do exercise and make yourself healthy, friends would be helpful in that process and exercising is definitely a good way to be healthy.
D. most closely match their sweat rates