The Jon Jones comeback has begun. The UFC heavyweight champion announced late Tuesday night that he’s back to training for the first time since having surgery on a torn pectoral muscle suffered last October. Jones made the news known with a post on his Instagram, posing with his teammates and long-time coaches Greg Jackson and Brandon Gibson. “First day back in the gym since my injury, felt amazing. And so it began,” Jones wrote. View this post on Instagram A post shared by Bony (@jonnybones) Jones tore his pectoral muscle ahead of a scheduled title defense against former champion Stipe Miocic.