One way to do this is to count your strokes per lap. Fewer strokes generally mean lower energy expenditure.

这个练习的一种方法是计算一个来回的划水次数：更少的划水次数意味着更少的能力付出！

youdao

One way to do this is to count your strokes per lap. Fewer strokes generally mean lower energy expenditure.

这个练习的一种方法是计算一个来回的划水次数：更少的划水次数意味着更少的能力付出！

youdao