For some runners, logging miles every single day feels like the ultimate badge of dedication. But when it comes to whether running daily is actually good for you, the answer isn’t entirely clear. The ...

Cherie Gruenfeld, 81, is an Ironman Hall of Famer who completed her first marathon at age 42. She retired from competing at 78 with 14 world titles, and still competes in half-Ironmans and ...