Septuagenarian CrossFit coach Mike Suhadolnik refuses to let his peers age gracefully. Mike Suhadolnik, a former offensive tackle and middle guard at Illinois State University, spent most of his life powerlifting. At this best, he benched 350, squatted 450 and deadlifted 550 lb. His physique implied fitness. But when his daughter Molly and her now-fiancĂ© Tim Hahn asked him to overhead squat more than seven years ago, he couldn’t get the bar over his head. Then they asked him to do burpees. “I played football in college. I said, ‘No problem,’” Suhadolnik recounted. “I couldn’t do a burpee.” Disturbed by this, the then-65-year-old visited his doctor in Springfield. “I told him I wanted to live until I was at least 110 years old but that I did not want somebody pushing me around in a wheelchair, walking with a walker or having someone wipe my butt,” said Suhadolnik, today 223 lb. The doctor recommended changes...