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mixed exercise · noun
Exercise that mixes several different kinds of activity — running one day, swimming or lifting the next — so that the whole body gets used, including the muscles your main sport leaves out.
交叉訓練
Picture two lanes side by side, and someone out of their own lane into the next one for a while. That crossing-over can be held as the whole idea of the word. You keep your main lane — the runner is still a runner, the cook is still a cook — but the time spent in the other lane wakes up what your own lane never asks for, and shows you what happens over there.
可以想成兩條並排的跑道，而有人從自己那一條跨到隔壁那一條走一段。這個「跨過去」的動作，一種想法是就是整個字的核心。你沒有放棄自己的主跑道——跑者還是跑者，廚房的人還是廚房的人。但在隔壁那條待過的時間會做兩件事：叫醒自己這條路從來用不到的部分，順便讓你看見那邊到底在忙什麼。
From the word’s history
Wiktionary gives the formation directly: cross- + training.
Wiktionary 直接記下這個字的組成：cross- 加 training。cross- 帶的就是「交叉、跨過去」的意思，所以整個字的畫面從字面上就看得出來。
Wiktionary, "cross-training"
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