To quote a famous fitness author, "Women are not a special population. They are half of the population." But they respond to heavy physical stress differently than the other half of the population. Despite this fact, women get the best results when they train for performance, because even though there are differences between men's and women's response to training, there is no difference in the quality of the exercise needed to produce the stress that causes adaptation. In other words, silly bullshit in the gym is silly bullshit, for both sexes. The women's "fitness" industry has been around a long time.
"Figure salons" were common in the 1960s, and my first job in the industry in 1977 was at a club that alternated hours for men and women. We had separate staff, with the women's shift working Monday, Wednesday, and Friday and the men's staff basically working Tuesday, Thursday, and Saturday, which pretty much precluded any 3-on/1-off training. But the women didn't train anyway. They exercised, toned, firmed, and sculpted. They were required by the club to train in tights (which the club sold), and sweating was strongly discouraged because exercising this hard was 1) apt to build bulky muscles, 2) caused the exerciser to make too much noise and that, combined with the sweat, might 3) intimidate the other ladies.