I used to believe that the fat burning exercise was the lower intensity workout until I proved myself wrong. I train three days a week for personal fitness and used to have one hard intensity interval and sprint day with high heart rates and the other two aerobic based workouts at a medium intensity. I was maintaining my weight with no complaints. Since I decided to begin training for local time trial events I have changed my three day training program to two hard intensity days and one medium intensity day. In the month I have done this I have droped an additional 5 lbs. of body fat while still having to eat more to make up for the harder workout days. I feel like I am eating too much at times but the scale tells me otherwise