I'm putting here the same post as on the C25K forum, because it concerns my oxygen level which goes down at exercise.
I went to the gym today for my third "run" on the bike. I took my oximeter swith me because the bike's HR doesn't show. Mine indicated 117 HR. I was a bit distracted by my friend a district nurse, as we were chatting. Still I did the time of 15 min 32 and the distance was 1.80 miles (2.89 km)
My level on the bike is from 2 - 4, probably not very intense, but I'm thinking about my O2 level which goes down to 87 during the exercise! That's because of my COPD.
I shall attempt week 4 next week! On the whole, I feel good about it.