Thank you all (: about shoes - When I had Nike, I got blisters from running. I bought saucony running shoes and I don't get blisters anymore. They're very light and that's the type of shoes I need for long distance running on the treadmill..

5k less than 30 mins is good progress (: you're right, take your time with longer distances, that's what I have done before running 10k... I began from 4k, then 5-6 to 7-8 and now i'm doing usually 9-10.