弯曲膝关节举起大腿，同时蹬腿呈骑行动作。
Bend knees and lift legs and pedal with legs in a cycling motion.
第二次蹬腿时，使身体在水面下保持一种紧张的流线型——做以上水下蹬腿练习时，努力体会你的动作。
During the extra kick, maintain a tightly streamlined body line just below the surface - feeling much as you did when doing the Underwater Kicking exercise above.
第二次蹬腿时，使身体在水面下保持一种紧张的流线型——做以上水下蹬腿练习时，努力体会你的动作。
During the extra kick, maintain a tightly streamlined body line just below the surface - feeling much as you did when doing the Underwater Kicking exercise above.
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