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Along with jogging and swimming , cycling is 1.........all - round form of exercise . It can help to 2....... your strength and energy, giving you 3..... efficient muscles and a stronger heart . But increasing your strength is 4........ the only advantage of cycling.Because you 5........ not carrying the weight of your body on your feet , it's a good 6....... of exercise for people with painful feet or backs . However , 7....... all forms of exercise , it's important to start slowly and build up gently . Doing 8.... much , too quickly can damage muscles that aren't used to working . If you have 9..... doubt about taking up cycling for health reason , talk to your doctor and ask 10........ his advice.