第二个阶段，会增加一部分速度训练，包括乳酸门槛跑和长距离的反复跑。
Phase two, preparation, adds a layer of speed by introducing tempo runs and long repeats.
根据盖利森的意见，光可以通过不同的介质运行，如在通过冷冻的纳气时，光的速度实质上变慢了。 然而这是因为光线在运行介质里的原子之间时，会反复地反弹。
Light traveling through different mediums, such as chilled sodium gas, does slow substantially, but this is because the light is being bounced between the atoms within the medium.
有意识地按照教学设计模型的步骤反复工作，将加快教学计划的速度和清晰度，保证关键的教学原则都被用到。
Consciously working back and forth through the steps of an ID model will add speed and clarity and insure that key instructional principles are addressed.
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