I'll start by saying I did it 👍
It was tough going towards the end though.
The last three minute run was really hard on my calfs and I knew I still had a five minute run left.... Thankfully the breathing was ok so I just kept the legs moving and ran through the discomfort.
I'm interested to know if anyone else's breathing just becomes breathing in and out as you need it. I tried to keep to the advice to breathe in and out for four steps but have found that when I've done quite a bit I just need to suck it in and blow it out however many steps that takes, I don't care, just get that oxygen into the lungs. It ends up being in for three and out for two I think, but as I said, I don't concentrate on that 😜