Bicycling is a great form of exercise as well as a practical way to get around, but it also carries the risk of significant injury, especially head injury. Of course, an alternative to outdoor cycling is indoor cycling. Spinning classes are growing in popularity due to the intense cardio workout it involves. With any cycling exercise, it is important to stay hydrated and safe. Follow the links below to find WebMD's comprehensive coverage about the benefits and risks of cycling, how to get started on a cycling workout program, and much more.