Since all movement burns calories – it goes to reason that fidgeting can help you stay fit. But you better be doing a lot of it every day. This kind of incidental physical activity helps but is no substitute for exercise. Sorry but shaking your leg when you watch TV doesn’t replace a cardio workout. But if you park farther away or take the stairs instead of the elevator you will burn more calories and every calorie burned is not one around your waist making your jeans tighter.