For me the approach to my limit is preceded by a feeling of suffocation and shortly after the feeling of nausea. I've learned when to step back from the breathless regime and avoid the nauseous crash and burn situation in training.
This sort of thing, together with race reports involving vomiting or collapsing over the line, makes me think I don't try hard enough.
I experience pain whist running as a form of existential angst that is distinct from physical discomfort of muscular stress or breathing limitations. It's a classic edge -of-cliff dilemma in that the pain is a much to do with a fear that pushing harder will result in increased anguish.
DT - I think he was just using the conveniences, but didn't want to get wee wee on his trackie bottoms.
I advise choosing a plan based on the amount of running you feel you are able to do rather than the supposed target time, which in my opinion is meaningless.
If you can already do 10 then most likely you can already do 13. Many training plans do not recommend running for more than 2.5 or 3 hours in in a single session as the muscle damage and recovery required outweigh the training benefit from running for so long.
Bob - You current regime of monotonous laps of the playing field will, no doubt, be developing a mental toughness that should serve you well next season.
Charlie - I've eased off the intensity of interval sessions quite a bit this year, though the pace has increased I've allowed longer recoveries. Standard session is 4*1200m at quicker than 5k pace with 3min recoveries. It's hard but never uncomfortable.
Skinny - Can't help with your IT woes.
No deer or geese this weekend, but saturday lunchtime I went out for a planned 2*2mile tempo. Before I started the session I decided to pay a call in the nearby public toilets whereupon a young chavvy looking lad (burberry cap, reebok classics etc) standing in the cubicle with the door open and his trousers round his ankles.
Anyway, the subsequent session wasn't up to much I felt rotten, only did 1*2 miles and the two mile jog back home was an awful slog and I might have pulled my right calf slightly.
Due to the tight calf I intended to do a turbo session after the kids were in bed last night, but they wouldn't go to sleep so that never happened. Not feeling much love for running at the moment, so I think I'll draw the curtain on the 2014 season here.