Running with left hemiplegia

You will definitely have to stretch more if you run. I have been advised to do 15 minutes of stretching in the morning and 15 minutes at night. You can get newsletters that "warn" you of what kind of muscle tightness/discomfort runners can expect and go ahead and proactively stretch and strengthen those areas more, for example the quads. I have been running for 2 decades now and I have spastic hemiplegia on my entire right side. I have only gotten back to running recently after taking a month off following a rough fall. 
I would say that you know your body best BUT get a professional to look at where you are tight. I didn't get physical therapy for a decade and I definitely regret it. I have a sports massage therapist who is doing amazing work and changing my life.
I would DEFINITELY look at your hip adductors. I have just been informed that my hip adductors are greatly affected by my hemiplegia. I remember vaguely hearing about my adductors as a child but this is all news to me. I wrote a separate post about it today. I have been given exercises to strengthen them and also stretch the thigh compartment area, and I have already seen an amazing improvement in weight bearing and the level of tension in less than a week.

Also, I have read this about all runners, but I think it is esp true for those with CP: do not sit down for 8-10 hours a day straight of inactivity (aka cubicle creature, long commute, etc.) and expect to be able to run well or without strain. Get plenty of walks spaced in your day if that is you. Expect your gait and hip problems to worsen if you do not actively stretch. 
There are plenty of yoga poses online for runners! I have found that the treadmill is wonderful as it "guides" your body to correct movement, or movement that is as good as it gets, so get a treadmill workout in every once in awhile even if it is not your thing.
EACH RUNNER has to push his/her body to the limits. I have found this is hard for me because people with CP know fatigue and burn-out all too well, in addition to the possibility of falling. So I think that naturally scares us. There are definite thresholds that CP runners break through that is harder with a hip misalignment, restrictive fascia, uncooperative muscles, tight tendons, and on top of this a body that just might not want to push itself. I'm sure my right leg is shorter as well though I don't know, but my right foot is definitely smaller. Also, possibly your left lung might not have developed to full capacity, affecting your running, or at least the way you breathe. My right lung did not fully develop and I get stared at because of how heavily I breathe sometimes, though I sometimes am not even aware of it.
Compete with yourself every time you run, go at your own pace but still steadily improve.
Running is definitely mind over matter, but in our case that mind has been permanently damaged. Still, you need to believe in yourself and you can do it. You've got this!

Haha yeah @TreeGillions be prepared to lose a few toenails. Basically anything normal runners experience will be experienced with a vengeance as someone with CP. And don't let your non-affected side compensate or dominate too much! Don't let your affective side get too passive or go on "auto-pilot" as I like to call it, utilizing the contracted muscles and getting lazy by allowing the unaffected side to do most of the work.

Best of luck!

Hi TreeGillions,

I am a master's student at De Montfort University, Leicester and for my major project I am currently designing a running shoe for people with Cerebral Palsy.
Hopefully this project will help improve the athletics performance and quality of life of people with CP. Rest assured you are not alone, there are many people out there with the condition who do like to run!

I was reading your post and I would very much like to include you in my research, therefore if you could just fill in this quick survey I'd be very grateful:

https://survey.zohopublic.eu/zs/9zBBuo

Thanks!

Will