My leg muscles hurt and I can feel "the burn" as I work out. This is always a good sign for a work out. You don't want to push yourself too much, but you do want to feel it. I'm very satisfied with the work outs it gives me. Of course, I'll get to the gym and won't keep this as my primary workout, but it's good for now when I am just starting off. Yesterday it says I burned 164.4 calories and today, since it was a higher intensity, I burned 211.3. I know these are just estimates, as all calorie counts are, but I've heard from researching that it is usually 80% accurate. That's a pretty good percentage.