2. BOSU balance trainer - $150
BOSU stands for "both sides up," which means you can use it with the flat or round side up, but it's easier to start with the flat side down. For a great cardio workout, use it as a stepper, or stand on it and bounce up and down. It's good for strength training, too, so do squats, lunges and crunches with it; turn it dome-side down and do push-ups. All of these exercises will improve your core strength, stability and balance.
If you can, buy the actual BOSU ball, not a cheaper imitation. The BOSU comes with the ball, plus a video, pump and manual. If you buy one secondhand, make sure there are no punctures, leaks or tears.
Try this move: Squats. Lay the ball flat-side down. Stand on it with your feet shoulder-width apart and your weight primarily on your heels. Bend your knees and lower into a squat position, either with your arms extended in front of you or with your hands resting on your waist. To keep your form in check, stick your butt out (like you're sitting in a chair), keep your eyes and chest up, and your core tight. Return to a standing position. Do three sets of 15 repetitions.
Calories you'll burn: This is more of a resistance-training device. However, if used as a stepper, you'll burn calories, but fewer than if you jump rope.
What to watch out for: This is an unstable surface, so if you have poor balance, you may want to stick close to a wall when starting out. If you have back, shoulder or knee issues, some exercises may put too much pressure on those joints.
