
On Monday and Friday mornings, you can find 81-year-old Harry King teaching workout classes and giving one-on-one training sessions at Planet Fitness in Greenville, South Carolina. Two years ago, King saw a help-wanted sign for a fitness trainer at his local gym, and the prospect of trying something new enticed him.
“I said, ‘Hey, I'm in,’” King tells Fortune, who began the fitness trainer certification process at age 79 and applied for the position. “The rest is history.”