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along with jongth and swimming, cycling is (1)...one of the best....... all-round form of exer. It can help to(2)..increase...... your streng and energy,giving you (3)..more.... efficient muscle and a stronger heart. But increasing your strength is (4).not...... the only advantage  of cycling . because you (5)...are.....

not carrying the weight of your boby on your feet ,it's a good (6).form...... of exercise for peopln with painful feet or backs , However,(7)....with..... all forms of exercise , it's important to start slowly and build up gently. doing(8)...too.... much, too quickly can damage muscles that aren't used to working. If you have(9)...any.... double about  taking up cycling for health reason, talk to your doctor and ask(10).....his/her....  advice