10 Unwritten Rules of the Gym for the Post-New Yeara s Crowd

... assume that if your stretch-pants are made of cotton, we can see your entire rear. True story: I once spent an entire yoga class staring at the undies of the girl in front of me because every time she bent over they were clearly visible through her ...

http://www.phillymag.com/be-well-philly/2014/01/02/gym-etiquette/