I’ve been doing C25K on treadmill at gym, and doing ok. Just about to start week 7 and have managed the longer runs up until now. However! This morning I went out for a jog with my 5 year old and was dying after 10mins! Didn’t think pace was any faster than treadmill, literally red faced after 1mile. I’m gutted, thought I was progressing 😫 Beginning to think the treadmill is not doing me any favours.