In order to not fall through this to the floor, you have to strap it pretty tight. And when you do that, then stop holding yourself up and let your legs relax, the pressure on your chest cuts off your circulation. I nearly passed out, and if I had that would have been very dangerous because there would have been no way for my body to fall to the floor and cause me to start breathing again (normally if you faint, you fall down and once you're horizontal, blood can get oxygen to your brain) so I wSee full review