No situps... in addition to being a terrible exercise that puts unnecessary strain on your back, it's a strength exercise, and as such, you can't really track calorie burn with it. It does burn calories, but not the way cardio does. You also need to take the strain off that knee, and rest before you do more serious injury... listen to the pain! It's telling you to back up. Don't try to "work through it."
Check out the Sparkpeople fitness section for suggestions; looking for "low impact cardio" got me this one for you: www.sparkpeople.com/resource/fitness_artic
Are you doing any strength training? You don't mention that. Strength training is a critical part of a complete exercise program. Strength training helps make your cardio more effective, and makes the fat you do have look better on your body. It also helps you burn more calories at rest. :)
I also notice you say you're doing the treadmill 5 days a week? It's best to work up to that level of activity... were you running or walking? How long have you been doing that?
It's best to start out slow... Sparkpeople recommends 30 minutes, 3 times week to start out. Once you get used to that, you can start adding more cardio. When I first got started, it was hard on me to do that 30 minutes... but now, I'm doing 1-2 hours a day, 5 times a week, and I love it!
Edited by: DRAGONCHILDE at: 5/8/2012 (21:32)