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se? skip swim play football skate play basketball ski Ride a bike, ride a bike, Riding is exercise. Walk to school, walk to school Walking is exercise. Play pingpong, play basketball. Playing sports is exercise. What is exercise? Exercise helps make your body healthy and strong. ? help do sth. 幫助做 … 有助于 … 鍛煉 有助于 你 的身體健康又強(qiáng) 壯 。 How many:多少 How m