There is a lot of chest hair, but why not hand hair and leg hair?

First of all, you should know that male body hair is determined by genes, not because some people are misled into thinking that it is caused by excessive androgen secretion. There are many kinds of androgens in men, which are similar, but the sensitivity of skin hair follicles to androgens is different. Some people have sensitive skin hair follicles and strong body hair.

Women's skin hair follicles are extremely sensitive to androgen, while women's androgen is very low, so if women have too much androgen (or low estrogen), they may have more body hair. But this does not apply to men.

Fitness enthusiasts increase high levels of androgen, which will not lead to the increase and elongation of body hair. Some people lack androgen, but their body hair is still very strong.

Some people have a lot of body hair in one part of their bodies, but little hair in other parts. Some people have more hair, while others have less hair. These are all individual differences determined by genes. It doesn't make sense to explain it with hormone levels.