First, as with most things in life, individual results may vary. Depending on your body weight and effort in the Red Room, it is possible for clients to burn from 700 to 1,000 calories per class. But it doesn’t end there. Vigorous participation can also help raise your resting metabolism rate so you can burn more calories even after you leave the Red Room. This is what we call the “after burn.” Burn, baby, burn.