Instead of: A treadmill
Use: A fitness DVD
Size: A DVD
Expert says: A study by the American Council on Exercise found that during a 40-minute boot camp exercise DVD called "The Method: Cardio Boot Camp" with Tracey Mallett ($10 at amazon.com), the average man burned 480 calories and the average woman burned 300.
"DVD cardio programs create variety in the workout, which keeps the body from hitting a plateau," said Savion, whose favorite fitness DVD is an 11-DVD set called "TurboFire: 90-Day Intense Cardio Conditioning & Interval Training Workout DVD" ($145 at amazon.com). "You'll be given cues, instructions and form guidance to prevent injury, and to make your workout more effective than just hitting the treadmill for 30 minutes."