For my recovery run after my 10k I went for a 5k run with my daughter who's visiting from New Zealand. After half a K she glanced across at me and said 'pull your shoulders back, put your head up. You're running like an old woman' Never one to mince words my daughter... But she was right . I was aware from photos from the race that my posture looked hunched but had forgiven myself and just thought it an inevitable consequence of anno domini. However, bullied by Sally I made a real effort to straighten up and was amazed to find that not only did the run feel easier but I shaved half a minute off my PB. I told my ironman son about this when I got home and he said that a tip he found useful was to imagine you were towing a kite- one of those parasail things which was attached to your shoulders and was trying to lift you up. I tried visualising that yesterday and it was amazing. My shoulders stayed back my body leaned forward in a straight line and I ran faster (as witnessed by my garmin) I'm interested to know if anyone else has tried this visualisation thing? I'm a convert!