Why on earth do people (correction: girls) wear layers and layers of thick clothing to the gym?

I don’t get it! When I go to SWEAT, I want to be wearing as little as possible. Hell, I’d do it naked if I lived in a nudist colony. Yet, I look around and see these girls with zip-up sweatshirts, shirts underneath, and thick pants working their asses off on the treadmill…sweating and looking miserably hot.

I understand if it’s cold from your car to the building, but strip once you’re in! Right? Please don’t tell me these people still believe in “sweating all the fat out”...