Supination is something that naturally occurs in most runners, and it is a matter of genetics rather than running style. While there is no magical cure to fix this problem, there are a few things you can do to help ease pain and reduce the risk of injuries.
Of course, the right footwear is key. However, there are some other things that you can do to reduce pain. The most important thing you can do is engage in a proper warm-up and cool down before hitting the trails. A good warm-up helps to strengthen the muscles not only in your feet but also all of those tiny stability muscles in your ankles and lower leg.