Pic: Jon Jones startling before-and-after photo, teases April 23 return

Jon Jones used to spend his off-season tweeting photos of his "skinny-fat" physique.

Then he nearly coughed up his 205-pound strap to Alexander Gustafsson at UFC 165 and probably realized it was time to take things seriously. While personal problems outside the cage gave him pause (and took away his championship title), "Bones" is back and looking better than ever.

During his absence, Daniel Cormier scooped up the light heavyweight title by submitting Anthony Johnson, then successfully defended it against the aforementioned "Mauler.