Most people don't start training until something forces them to — a bone density scan, a fall, a parent who can no longer get out of a chair. This episode is for the adults who'd rather not wait for that moment.

Ralph Reiff, 68 and still working the field with the University of Indianapolis athletic training staff, and Scott Hudson, who has spent three years building a strength class in Carmel, Indiana for women who graduated college in the 1980s, talk through what adult strength training should actually look like.

They cover the mechanism behind bone density — load the bone, and the bone responds — and how modest that loading can be: chair squats, a 2 lb dumbbell overhead, toe raises, a 2 inch box. They get into grip strength as a marker tied to mortality across heart disease, cancer, and cognitive decline, and the overhead kettlebel ...