I went to a HIIT class today. It was pretty awesome. It was thirty minutes of intense work. I'm still having a problem with my calories. I have been only eating 1200 calories per day and I think that its very low for the amount of exercise I do each week. So for the rest of this week and next, I'm going to eat 1600 calories on the days I workout, 1200 on days I am not, just to see how it goes.