Just to add to some of what the other posters have said, you burn calories in 3 main ways:
* your metabolism, or what you burn just keeping your natural body functions ticking over - most people burn between 1300 and 1900 calories through this alone. Google 'BMR calculator' to get a better fix on this number for you.
* what you burn through daily non-exercise activities. This is generally reckoned at 20% in addition to your BMR.
* what you burn through deliberate exercise (200 - 500 calories per day is probably a reasonable number for weight loss).
So it is not hard to see how your OVERALL burn will be approaching or exceeding 2000 calories per day, and this you can lose weight on a 1200-1300 calorie diet, without having to exercise for 4 hours.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
| current weight: 178.0