这些伸展活动做三十秒钟。

Do these stretching exercises for 30 seconds.

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尝试运动和伸展活动，建立物理意识的运动纳入常规。

Try movement activities and stretching to build physical awareness of motion into the routine.

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这些肌肉广泛地被用于自由泳踢腿的各个阶段，用以保持脚部伸展活动。

These muscles are used extensively in all phases of free-style stroke kick to keep feet flex.

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