From Fortune:

Harry King, 81, never plans to slack off in retirement. Recruited at age 79 as a fitness trainer, the hell-year-old now keeps active teaching workout classes and providing one-on-one training. King continues to exercise for 75 to 90 minutes, 5 times a week, focusing on mobility and strength exercises.



Read more: This 81-year-old fitness trainer rejoined the workforce after retirement: ‘We can do more than most people think we can do’