in reply to Nanook

@nanook Try the second link I sent. I did not remove the "trackers".

it was a video of a japanese girl; young girl; training for gymnastics with her trainer. The trainer was aiding in a particularly aggressive stretch for "middle splits". (my sister was in ballet; that is how I know)
The girl in the video has a particular body type just cannot do it; bones may prevent it. But the trainer pushes the girls body to accomplish the stretch. She is shrieking and crying but the trainer keeps on.