Extend your arm backward, keeping your elbow straight. Hold and slowly return.
保持你的肘关节伸直，维持几秒再慢慢回到起始位置。
Return your left heel to the ground and simultaneously let your right elbow move back to your side as it comes down.
将左脚后跟踩回地面，同时右肘关节立即靠回身体右侧。
Return your left heel to the ground and simultaneously let your right elbow move back to your side as it comes down.
将左脚后跟踩回地面，同时右肘关节立即靠回身体右侧。
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