Over-the-counter insoles can improve the fit and function of a running shoe, and some promise to do everything from reducing foot fatigue and plantar fascia strain to increasing running efficiency.

What to look for A thin gel or foam cushion that covers the ... or ask if you can return an opened package if there's not enough room for the insole inside your shoe. We liked The 2oz.

with Jane Atkinson This thin insole has 32 sensors to tell you how and where your foot is striking NURVV Run, usually £250 but on offer for the next week with 30 per cent off at sportsshoes.com ...