Nervious energy good for you?
There was a story documenting the activities of 2 male flat mates. One was overweight and the other was slim. Both seem to lead very similar lifestyles and ate almost the same foods.
Quite baffling, until they followed them with cameras. For example when the slim guy was talking on the phone, he was pacing up and down the floor whilst the fatter guy slobbed on the couch when on the phone. The slim guy would be cleaning as he went while cooking and the fat guy just put it in the oven and back to the couch. These scenarios were repeated with most things they did. It seemed the slim guy was full of nervous energy, burning up calories all the time.
Just goes to show that ANY kind of movement burns off the calories. You need not go into a frenzy of exercise.