Exercise is a subset of physical activity that is planned, structured, and repetitive and has as a final or an intermediate objective the improvement or maintenance of physical fitness.  Group of athlete women exercising at the gym. Fitness women exercising at gym.  Group of people in an aerobics class at the gym stretching looking very happy  Portrait of smiling people doing power fitness exercise at yoga class in fitness studio    Group of young people doing exercises together in gym 
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