The bigger you are, and how inactive you are, the more calories you burn. So, if you’re really fit and active, and/or are tiny like me, your body is very efficient, and doesn’t permit you to expend a lot of calories as a safety measure. To get a good idea of how many calories you’re burning, buy a heart rate monitor. With my Polar watch I learned that a 20 minute Classical Stretch Pilates-ballet video only burns between 50-80 calories. I started checking my other workouts and this is what I found: 30 minutes on incline treadmill at 3.3 mph = 105 calories. 35 minute hard hike = 162 calories. 60 minute kickboxing class = 354 calories.
If you’re serious about losing bodyfat, you have to reduce calories in addition to consistent exercise.