每隔几天，或当你开始感觉疼痛，开关的变动，要么踢腿的狭窄或宽，为一组，或第二天，或下星期。
Every few days, or when you start feeling pain, switch to a variation of your kick, either narrow or wide, for the next set, or the next day, or the next week.
每隔几天，或当你开始感觉疼痛，开关的变动，要么踢腿的狭窄或宽，为一组，或第二天，或下星期。
Every few days, or when you start feeling pain, switch to a variation of your kick, either narrow or wide, for the next set, or the next day, or the next week.
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