All the Good, None of the Bad — Anyone who cares about staying fit knows that biking is one of the best forms of exercise. Not only does it keep your heart healthy and tune up your cardiovascular system, it's completely non-impact, so it's gentle on your joints. Biking builds strong legs and increases your stamina. And it absolutely helps to eliminate that stabbing pain in the knees caused by arthritic deterioration of cartilage behind your kneecaps. (more)