How does the reproductive system work? why?

During puberty, they “wake up.” The ovaries start making more estrogen and other hormones, which cause body changes. One important body change is that these hormones cause you to start getting your period, which is called menstruating.

(a) is not correct because one does not get increased cholesterol  from lifting weights.(b) is not correct because lifting weights cannot reduce the risk of a hereditary disease.(c) is not correct because back pain isn't a benefit! and plus, if he lifts weights properly, he should not have back pain.(d) is the correct answer because his ligaments will gain mass, making it easier for him to carry heavier weights and he will also be stronger!