You burn calories in 3 main ways:
* Your metabolism, or what you burn just keeping your natural body functions (breathing, heartbeat, digestion, etc) ticking over. Most people burn between 1300 and 1900 calories per day. (Google 'BMR calculator' to get a better fix on this number for you).
* Normal daily non-exercise activities. Generally reckoned at 20% in addition to your BMR for a sedentary lifestyle.
* What you burn through exercise - probably 200-500 calories for most people for a 30-60 minute workout.
As you can see, exercise is a fairly small component in you overall burn, although useful in swinging a small calorie surplus (which will have you gaining weight) into a calorie deficit.
And at 1200-1500, you are probably already at a deficit even before you start working out.
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.
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