Okay, so a few years ago I was at a boy scout summer camp. The camp was Hale Scout Reservation here in Oklahoma(3rd best in the country). For the week we were there we stayed in large green canvas tents like these:
Most of the tents were under tree cover to some degree but not all. Since most of the tents are probably older than me the aren't in the best condition. They were replaced some of the damaged one with newer ones. One big difference between the old and new ones were that the new ones were a lot darker green and coated in a rubber like material. Now if you've been to Oklahoma in the summer you would know it can be 110F at times. I think you can imagine what a dark, rubber coated tent with the door flaps closed, in the sun, in 110F, will be like inside. Believe it or not that all had a point.
One year a kid from another troop and me were talking and he mentioned that one of the guys in his troop dressed in three or four layers of sweat shirts and pants and got into one of these tents in the sun and started to exercise. I told the guy I was talking to his friend must be crazy. He responded that he drank even more water than most of us normally did and had someone check on him every few minutes. I still thought he was a madman but he told me it worked really well for losing weight fast.
I just remembered this a couple days ago and want to know if you all think this would even work in the first place.
Sorry if this is in the wrong forum. I wasn't sure if it should go here or in the science board.