I am a runner. I started running as an adult and it took me a long time to build up endurance. Over the years I have seen one man at my park out running that is very senior. He is a very dedicated runner and turns out, very accomplished. (I had a chance to meet him after my daughter was born. He's a pediatrician in her group.)
Whenever I see him (or think about him), I am very inspired. For all of my challenges when I am out there, I know his are much greater. I tell myself, if he can do it . . . so can I.
Some days, I need a lot of motivation to make myself get out there. Having a role model is certainly one way to overcome that part of your brain that wants to stop.