This as-told-to essay is based on a conversation with Robert Warden, an 82-year-old pickleball coach in Utah. It has been edited for length and clarity. In 2016, when I retired from my role as an on-air chef at a shopping network, I was looking forward to slowing down, enjoying myself, and playing a lot of tennis . That's not how things turned out. A few years later, at 75, I woke up one day with a sharp pain below my left shoulder that wouldn't go away. After a visit to the doctor, I was