Doug Bopst was always “on the heavier side” growing up, and by age 18, he had another problem, too: an opioid addiction. But when he got busted for selling marijuana and wound up in jail in 2008, he turned things around, thanks to a cellmate who pushed him to get in shape. These days, he’s a personal trainer with a book, The Heart of Recovery, due out in March. This is his story.