If you're a fan of watching TV while on the elliptical, stationary bike, or treadmill, commercials can be a real drag. So use those few minutes to get your heart rate up and sprint as fast as you can. Pay attention to nothing but going as fast as you can. Once your show returns, you slow down to moving at a moderate pace. Not only will adding sprints make the time go by faster, adding interval training to your workouts has been proven to reduce belly fat. Talk about a win/win workout.