Mark Stone

+1 to that. Exercise that is similar to bicycling changes our entire body from the inside, systemic changes. Our hearts are stronger, our circulatory systems are cleaner and stronger, our lungs are much more efficient. We think more clearly and carry a better outlook. With a regular aerobic program, enzymes proliferate in our muscles that continue to "burn" fat even when we are at rest. Our bodies have strengthened immune systems and heal from injuries faster. We not only lose weight, we become healthier. Cyclists as a whole have lower rates of heart disease, cancer, diabetes and alzheimers. Skin quality is improved. Sleep quality improves. We become more mobile. If people are primarily concerned about their calorie expenditure, that is fine; but they may be surprised down the road by the most important changes when we bicycle.