I made it, and felt fine. Had a few days off before hand, but did spend some time running for a bus while in London with my daughter. She was amazed that I made the bus, and I didn't get out of breath! Kept shaking her head and smiling at me. She's ex army and runs all the time. I'm not sure about the 20 min run on day 3 but hopefully that will be ok. My husband tells me to take my phone with me in case I am need rescuing. Haven't need to do that so far. Hopefully that will continue.