I have just started some very limited running, and have my final cardiac rehab session this coming week. So far I have been doing walk run, alternating 1min walk and 1min slow run (about 10min mile pace), which keeps my heart rate in the permitted zone. I did 11min in all, 6 runs and 5 walks, with about 20 mins of warm up indoors of waving arms and legs about like the rehab class. I hope when I have had my final rehab I will be allowed a few more beats per minute, and can work towards continuous running, be it ever so slow.
Glad to here everybody having fun at the races - enjoy it!