Hellow guys, Welcome to my website, and you are watching WHAT happens when we stretch our BACKS? Are BACKBENDS BAD for us? FLEXIBILITY SCIENCE EXPLAINED!. and this vIdeo is uploaded by StretchAndTrain at 2021-08-18T07:00:34-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.