The workout routine that leaves this 82-year-old fitness instructor feeling like he’s 50

For Harry King, an 82-year-old personal trainer, it was an arthritis diagnosis that inspired his fitness journey. 

When he was in his 60s, a doctor diagnosed him with arthritis in his knees and told him to limit walking. King did as the doctor advised, but the lack of activity caused him to gain weight and feel worse overall, he recalls. King decided to find other ways to move his body, and began exercising regularly on the stationary bike and lifting weights.