The key to the exercises presented below is to maintain good form and don't look sloppy stretching.

下面的练习的关键是保持良好的姿势，拉伸不要看起来草率。

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The book also has a full answer key to all exercises.

这本书也有一个完整的答案主要向所有演习。

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The key point to keep in mind here, however, is that these projects are real, not hypothetical exercises.

但是，在此要记住的关键的一点是：这些项目是真实的而不是假设的练习。

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Since the manual with instruction and photos for how to correctly perform the exercises is not available, my summary is meant as an outline for the key components of a comprehensive knee-injury prevention program.

CNN: How do I protect my daughters' knees from sports injuries?