Never had this before ... a slight feeling of breathlessness and having to breathe in deeper than usual. And a distinct wheeze when breathing out hard (but not in) ... sometimes with a kind of "hoop" sound, but I'm pretty sure I haven't got whooping cough :-) This was all during a gentle 9-mile plod this morning, which I finished otherwise feeling fine.
Noticed it also on Friday, during some half-mile reps at speed, especially towards the end when I was running out of puff.
No bugs or colds lately. Never been asthmatic. Don't smoke (but did for 25 years).