My motivation is thinking back to my hospital bed and recovery last year, and making on while I'm fit and well.
I have an odd outlook (according to Mrs I) - in that what can be perceived as a negative, I will see as a positive.
JT's being a perfect example, where his condition could/should be seen as detrimental - compared to those folk without such a condition. But, JT turns that situation into a positive by seizing every opportunity and cherishes his adventure time, whereas others squander those moments because they don't have something to motivate them to get out & about.
And I appreciate it is easy to say this from the viewpoint of not having something such as Crohn's disease, but you have the advantage over the 'ditherers'.