Wow, thats fantastic quality.
Obviously using something like a DSLR ensures that you get a nice image, compared to using a GoPro or something with a camera built in. What struck me most was just how smooth it all was, it was like stedicam footage from a helicopter. I assume being a custom build, its a pretty hefty and smartly designed copter?
On a different, related note, I signed up to my local Park Run two years ago and still haven't been! Don't have any mates that want to do it, but I assume its all good just turning up on your own.
Are you going to let the Park Run organisers know about the video?
Might get yourself in the weekly newsletter.