你必须保持你的高强度，你必须确定你已经开始短跑，当机器已经达到你的目标速度时。
To keep your intensity high, begin the sprint portion of the interval when the machine has reached your target speed.
你必须保持你的高强度，你必须确定你已经开始短跑，当机器已经达到你的目标速度时。
To keep your intensity high, begin the sprint portion of the interval when the machine has reached your target speed.
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