Jason Bjarnson on Instagram: "Here’s a new challenge I want to share to the world! Please like and share and see if we can make it viral! Thanks @officialcommandarin for recording and an insane workout. #flip #backflip #ripped #abs #sixpack #ninja #gymnastics #gym #gymnast #tan #outside #challenge #tirechallenge #parkour #freerunning #fitness #fitlife #fit #muscle #workout #weightlifting #tire #buff"