The main problem with a heated room for yoga practice or any exercise is that if the body can not cool it self through sweating core temperature rises, the heart rate and blood pressure start to rise to compensate. Along with excessive sweating, cardiovascular stress, and the inability to cool (unless you run out of the room!), you are putting yourself in a real and risky situation. Yes you can lose weight but you better replace it and fast when the class is over…. Loss of water is responsible for the immediate decrease in weight. (You could just buy a rubber suit and sit out in the sun on a hot day… overheating and losing a lot of water as your body desperately tries to bring your core temperature down so you don’t die!) Yes you will get the benefits of the exercise but I suggest you skip the high heat and enjoy the benefits of YOGA for weight loss which can often come from the stress reduction practice, breath work, mindfulness and the challenge of the asanas. Always stay hydrated, work hard if you are ready, and listen to your body. Get healthy and fit with less risk and skip the “rubber suit”.