Thank you so much for all the the encouragement. I knew I could do it because you said so!
I could not believe Jo Whiley when she cut in saying you've done 5 mins. ONLY 5 MINS! It had to be 10! I was doing a different route so couldn't judge time. The next 5 mins were Ok and the 3rd 5 mins actually felt great. But maybe then the last 5 mins were very tough. After successfully running for 15 mins, there was no way I was going to stop and not complete the full 20.