Just when I think I couldn't run another step..

I have exercised enduced asthma, and a lot of times I find it very hard to run for a long period of time. So I've started to time myself in intervals of jogging to my time walking, mixing it up a bit so I can get a good exercise while also not running out of breath.
But whats my biggest motivator that helps me keep going just when I think I couldn't run another step?? Imagining pictures like this!

Some may find this silly, but it really works for me, and hey if it works, why not! lol
It really helps if your on a track and have people running slower behind you and you imagin them as zombies chasing you.
Whatever it take to keep you motivated keep it up! You'll soon see results and the silliness will pay off in the end!