Firstly a belated thanks to those who congratulated me on graduating 2 or 3 weeks ago. Sorry for not responding sooner, but I wasn't online for a couple of days then the website was being "upgraded", etc, etc.
Anyway, since graduating we've been having a heatwave here in sunny England, so have been out running early when I've been able to. Have to admit to missing one run because of commitments. Another time I stopped at 25 mins near the end of my run as I was feeling very light-headed and didn't think it was a very good idea to keep going. How do you know when to push yourself and when it's stupid? I think I always err on the safe-side! I guess if I'm on my own it's better to be safe than sorry - and as I'm doing this running to get fit I don't want to do more harm than good. But now that I know I can do 5km in less than 30 mins, how much should I be pushing myself?