有教练和没教练的训练区别是，前者容易形成“复合增长” (compounded growth), 几年下来身体素质和健康水平大大提高。后者就卡在一个低水平状态下长期没有进步。“找好教练”这件事本身也值得不断摸索试错。一个有主权意识的人不会允许让这种小事卡住自己复合增长的步伐。
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