As you may know, I do the cto5k at the gym.
last week, i was a bit blown out after my 3 times 60 seconds at level 6 on the static bike. This new week, I shall reduce the level a bit, as I'm going to do 90 secs. and 2 minutes calming down catching my breath. I still will do ten minutes rather than 20 minutes, as I stay at the gym after to complete my hour on the equipment.
It's a pity that the instructors know nothing about this programme. I wanted to involve them in watching me, but they are apathetic, one told me the prgramme is only for running (no imagination) and the other told me, go ahead and do it (no interest)! I shall appraise myself then!