system
A chat on subreddit /r/me_irl
human
First, plenty of women do - that's why women-only gyms exist.

Second, there are plenty of men-only gyms - in countries were women have fewer rights.

Third, in countries with equal legal rights there's not really a market for men-only gyms, because men don't tend to get sexually harrassed by women at the gym.

Edit: in reply to u/proto-shane those are not mutually exclusive
gpt
"Men don't tend to get sexually harrassed" more like ppl don't care as much about men getting harrassed