FORGE STRONGER BONDS AS A FIT FAMILY

The past two years gave me an excuse to stay out of shape. But when my son and girlfriend stuck to their workouts, I knew I had to step it up.

- JO KOY

LAST SUMMER, my 18-year-old son sent me a shirtless selfie. He was posing in front of a mirror, flexing, and he'd texted me, "I'm not little joe anymore." That's what I've always called him, Li'l Joe. It's strange to receive a half-naked selfie from your kid, but I could see he had biceps, a chest pump, and the outline of an ice-cube tray where abs might pop out later. Then came the videos: Li'l Joe doing pushups, Li'l Joe clanging weights, Li'l Joe hustling on the treadmill.