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Exercise is a sort of gym. It can make body keep in health.But too much exercise could drop you end your life because body's muscle could not support too much presure.However,exercise should be fine to limit. We recommondate to do the aerobics because this is the most healthy way by the public. Running,jog,dance and body walking are aerobic. However, no matter teenagers or older and the which level that should do exercise in aerobic.