super intense flexibility training, I feel like my crotch was torn apart!

Please don't imitate the flexibility training in the video.
This video is for documentary only.

this video is my classmates and I helping each other to do the flexibility training, stretching our legs, makes them more flexible.

Declaiming：
Please don't imitate the training in this video by yourself. The students in the video are the professional and have been studying for more than one year. The teachers have more than five years of teaching experience, so they dare to train students like this.
The students in the video are challenging to a higher level of flexibility, so the training of the teachers is more severe. But this kind of training is harmless because the students have already warmed up before the training, the bones and muscles have been totally relaxed, after the training, the students will get the corresponding auxiliary massage to eliminate the muscle pain.
Everyone has limited ability to withstand the pain, so you can see some of the students screaming in the video, and some students are not. but This kind of pain is good in flexibility training. If it is not painful, it means that the student has not broken his own limit, then he will not make progress, and such pain is controllable.

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