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I keep getting blisters on the arch and also balls of my feet whenever I run anything over 5km, I did 10km the other night and when I got home and checked I had around 4 blisters on each foot and the last 3km was agony.
My trainers are about 3 months old and were fitted for me at a running shop so I dont think its them, and I lace them quite tight. The socks I use are cheap trainer socks I got from somewhere, so I'm guessing these could be the issue?
Any advice greatly received?