is this due to 1 - dodgy monitor? 2 - underlying illness? 3 - pushing harder than normal?
Worth thinking it through as 2 could be bad, 3 might well be good and 1 is easily solved with some more money!
Going off feel it's not a dodgy heart rate monitor. By the end of a 6min/km warm down I was out of breath which would normally not be a problem and I was coughing badly an hour later.
I haven't completely gotten over last weeks virus so I expect that played a part. At the moment I also suspect there's a chance I have asthma. Would make sense given that I possibly had asthma attacks after BUCs and the middle on Sunday. Also earlier in the term I was coughing a lot after hill reps and at the moment am getting out of breath really easily.
In terms of pushing harder my legs weren't exactly feeling great after a week of not doing anything but they weren't sore after, just a bit stiff. So in that respect my lungs were my limiting factor which doesn't normally happen.
I used to get asthma type symptoms after a chesty cold when I was training hard (esp in winter/cold weather). There were a few times I got an inhaler, used it for a week or 10 days then stopped. It was enough to settle the breathing problem and then I had no more issues until the following winter's colds...