I'm just back from my second run. I wasn't really looking forward to it as I found Run 1 quite tough.
However, I was pleasantly surprised. I completed each run section feeling I still had fuel in the tank and I wasn't really aware of my breathing, which I had struggled with on Friday.
Having read the website and forum quite a bit in the meantime, I did go out with the following in mind:
1) Slow it down
2) Don't worry about breathing
3) Look straight ahead of you, about 30 to 40 metres out in front, and avoid looking down at your feet
I also ran on a tarmac path today rather than the grass from Friday, which I think helped (though will my joints disagree with me tomorrow?).
Anyway, I hope this may inspire anyone else who found run 1 tough to get back out there.
Have fun and good luck!