"I need my exercise, and I can't do without it, and I think the older you get, the more you need it too. Use it or lose it," George Mueller said.

Ruth Chepngetich, from Kenya, runs with the Kenyan flag after crossing the finish line of the Chicago Marathon to win the women’s professional division and break the women’s marathon world record in Grant Park on Oct. 13, 2024. (Tess Crowley/Chicago Tribune)