I think you've gone to far into the anti-feminism mindset buddy Yes, it's not wrong for a guy to check out a girl wearing revealing clothing. But straight up staring at her for an hour? A gym is also not a public area but private property, which gives the management the right to set whatever rules they want. And the management usually includes in those rules provisions against exactly this type of behavior (because no one wants to be scrutinized in a such a manner when they work out).