型材用两手弯曲，扭拧强度较好，松手后能恢复。不能太软，象“面条”状决不能运用。
The 2 section with both hands, bending, twisting strength is good, let go after recovery. Not too soft, like "noodles" - never use.
如果你想让飞行员知道降落是安全的，把你的手伸到前面并弯曲你的膝盖。
If you want the pilot to know that it's safe to land, push your hands out in front of you and bend your knees.
幼儿蹲坐(腿腱)：两手放在婴儿车上，然后双脚与肩同宽，保持背部挺立，然后重复弯曲膝盖。
Tot squats (hamstrings) : Standing with feet shoulder-width apart cradle baby with both arms. Keeping a straight back repeat deep knee bends.
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