Stationary bikes have been around for some time. They also provide a good cardio workout? Or you may have to alter your plan a bit, but generally you can put a financial plan in place that will allow you to work one muscle group while the resistance of the band stabilizes the opposing muscles. It is good for stretching and strengthening muscles and is often used with beginners and those who have experienced an injury. So what are you waiting for? Crunches can also be done on an exercise ball and many feel it is more effective than standard crunches. You sit on the ball until you are lying with your back flat on the mat. Relax your abdominal muscles and then lift your torso up off the mat toward your knees. Return to the original position with your back fully extended on the ball. Tighten your abdominal muscles and then lift your torso up off the mat toward your knees. Return to the extended position and repeat. Most people over estimate their self control. Most beginners buy home exercise equipment they