Pete Wright, 65, of Dallas, played all sports in high school.
Not until a military injury during the Vietnam era, though, did he take up racquetball, the sport that became his passion.
He played at Texas Christian University, and also won the first organized state singles championships in the late 1970s.
He became a racquetball instructor and operated two pro shops in Dallas.
But, he says, "my knees were wearing out, and by the early '90s I was limited to swimming and biking."
Eventually, "my knees were completely worn out."
But he wasn't about to use multiple knee surgeries - he's had 13, including replacements - as an excuse to sit still.
He's still competing and will be playing for another national age group title in October.
Here are his thoughts on his regimen:
Typical week of workouts: I alternate days of swimming/biking with playing racquetball. Normally I work out at (a fitness center) six days a week for two hours. I also do light weights as a second workout twice a week.
If I had 20 minutes to work out, I would: Spend 10 minutes swimming followed by 10 minutes of light weights.
Proudest fitness moment: Returning to the courts again with my new knees.
Favorite healthy food: Fruit and health bars.
Favorite indulgence: Chocolate.
What I'd say to someone who wants to follow my routine: Identify activities you enjoy, get expert advice as needed, and know your limits.
What my workout says about me: I'm willing to make the sacrifices necessary to stay active for a lifetime.