[jasonpeacock]

I too had flat fleet, and wore arch supports for many years, but after training in barefoot running for a year I "fixed" the issue. I even ran a marathon in barefoot shoes! It sounds like an advertisement, but it was life-changing for me. (I'm also a big guy at 240lbs)

The book I used is "Chi Running" but there's many similar books.

[hgomersall]

Yeah, not quite the same but my arches stabilised by moving to a more forward strike - mid to forefoot. We've been careful with my son who is now 6 to have flexible soled shoes and he naturally runs like this (may not be related, but interesting to note).