这似乎是一种适应，它允许人类迁移到新的不同的地区，为改变生活习惯提供了机会。
It seems to be an adaptation, which allowed humans to move into new and different areas, opening up the opportunity to change living habits.
你的身体已经适应了某种模式，对赛跑者来说也是如此，身体习惯了单一的模式，那么稍微有点变化，就有可能会受伤。
Your body ADAPTS to its routine, and if that routine is monotonously habitual as with many runners, it doesn't take much of a change to cause an injury.
一旦您习惯了这种做法，并且适应了与您结对的特定人员，您就会进入这种流程，很自然地来回互换角色。
Once you get used to it, and to the particular person you're pairing with, you slip into a flow, switching back and forth naturally.
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