20 mins continuous running. Didn't see that one coming. Even Jo Wylie seemed a bit embarrassed asking me to do it! Total torture. But... I did it... just. The last bit was uphill and I was begging for the music to cut out and Jo to say 'slow down and relax'.
I guess they think you're ready / prepared for it, but damn... that was hard (for a 56 yr old).
That said, Cto5k is an amazing thing. For mental health, weight loss and fitness.