极限运动在舞台上确实非常令人兴奋，但台下的训练是非常困难的。
The extreme sports were indeed very exciting on stage, but training was very difficult.
运动资料-计算您训练时的个人心率极限。
Exercise profile - to calculate your personal heart rate limit for training.
运动资料-计算您训练时的个人心率极限。
Exercise profile - to calculate your personal heart rate limit for training.
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