Running

oh dude - sorry to harp on here, but if you go to a store and they give you a neutral shoe but with an insert/custom insole (there are some big money spinners about at present), thank them in true Hippy style and leave.
I only say this because over time, your ankles. knees and hips may have adapted to suit your running style. If you put any form of rigid insole in your runners - you are putting your joints into an unfamiliar position that, upon impact, will cause injury.
A specific, supportive running shoe is designed to absorb the impact and flex accordingly...
I apologise if that seems obvious, but my local store did exactly that, expecting me to pay £49 in addition to the trainers. Pah!

true to an extent, but podiatrists often prescribe an insole to correct poor biomechanics, so insoles can definitely have their uses. for most people, getting the right shoe is the best bet, you shouldn't need a £49 insole unless your podiatrist tells you to.