Just completed my second run of week 2, and so far in both runs, my left foot goes completely numb during the cool down walk. This didn't happen in week 1, and it doesn't happen during the actual running part, just in the final walk.
Is it a simple case of needing new trainers? If so, can anyone recommend a decent shop - my usual place is Sports Direct, but not convinced they have much (any) knowledge. Not looking to spend a fortune, less than £50 would be good.
If it help, I'm based in NW London