Well accidents do happen in gymnastics ad a lot of them are here for you to see. If you have heart problems don't look.
Why is Google the undisputable leader search engine? Why and when did Google win The Clash of the Search Engines!
I will share here my personal experiences as an amateur 'Weekend Stretcher'! I do stretching and my body feels great. I started not long ago but one can tell. And workouts with prior proper stretching are child play!