我最喜欢的，也是我认为最有功效的一个垂直练习，就是垂直蛙泳。
One of my favorite, and I think most functional vertical drills , is vertical breaststroke work.
我最喜欢的，也是我认为最有功效的一个垂直练习，就是垂直蛙泳。
One of my favorite, and I think most functional vertical drills, is vertical breaststroke work.
起初，我怀疑它对我是否有功效因为首两天的练习是毫无感觉的。
Initially, I was sceptical about it working for me as I could not feel anything after practicing it for 2 days.
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