Exercise bikes have been around for some time. They also provide a good cardio workout with reduced impact to knees and other leg joints. They typically do not fold up and can tend to take up space. Exercise bikes fall in the economy or moderate range for price in comparison to gym or fitness club memberships. Treadmills are another type of fitness equipment relative to their cost. Another low cost equipment alternative is a stretch band. These are just what they sound like, a stretchy band made of lycra, nylon or sometimes rubber. Sometimes called resistance bands, they allow you to get the equipment you already have. When you have high quality cardio exercise equipment to improve your already effective training. Lift your legs straight up above your head and bend your knees slightly. Squeeze your abdominal muscles and bend your knees slightly. Squeeze your abdominal muscles and raise your trunk off the ball to about a 30-degree angle. Return to the original position with your back firmly against the padding. You should have the Roman Chair set high enough that your legs dangle