I thought I could do 20 minutes 20 seconds intensive and 40 seconds rest, but no way. I managed 15 minutes at the same rate as above and I am pooped. I grabbed the Ipad to take a photo to show how did for record. The clock was still ticking but I did 3201 m... sure if this is bad or ok.
Tomorrow and all week I will keep to this routine and see how it goes. Alain will have a go tonight and we can compare, he will be fatser though for sure!