I am regulalry running 4 to 6 miles 3 times a week but since the onset of the colder weather I am really finding the first 10 minutes hard with my breathing. After 10 mins warm up I'm fine but those first ten minutes are a killer. I'm not doing anything different to normal and i don't have any health issues. Any suggestions or is it a case of work through it? Funny thing is I started the programme last December and don't remember any problems then.