Oh, the pain

Went for an early evening run last night and managed over 5 miles without it really hurting too badly. At the time. Afterwards my left ankle felt hot and achy. This morning it's my lower back and top of hamstrings - really quite painful but probably just a measure of age and unfitness and poor technique. Can't do anything about the age thing but the rest of it is negotiable.
Listened to radio 4 news followed by 'the unbelievable truth' which was quite entertaining and also just the right length for the run.
Not sure how boyf - who is fit but doesn't run much at the mo - manages to go out and run about 7 miles without thinking about it. Perhaps I think about it far too much and should just put up with the aches and pains and push harder, get fitter and stronger and generally improve (as opposed to worrying and planning and comparing...)