I'm in my 70s, I exercise differently than I did when I was younger. I enjoy paddleboarding and yoga instead of running marathons.

• When I was younger, I was competitive and ran marathons. I also cycled and enjoyed rock climbing.
• As I've gotten older, I've let go of the need to prove myself. 
• Now, I focus on getting movement in different ways, including paddleboarding and yoga. 

In 1987, I ran the Big Sur Marathon, whose inspired pitch, "Run Along the Edge of the Western World," was irresistible. It was my personal best of the three marathons I had run at the time, clocking in at 3:56.

Running races was typical for me in my 30s when I was highly competitive, achievement-oriented, and needed to prove myself.