This patient has severe hypermobility due to ligament laxity, the most common reason why patients presents at our sports podiatry clinic. As you can see, the carbon-fibre Heel Skive Wedge orthotic with an extrinsic forefoot varus extension allows a better mid-stance position than his own inherited ligaments at the end. Coupled with a decent shoe with moderate varus posting in the other video of him running eliminated his arch, foot and tibialis posterior (shin muscle/tendon) pain completely.
The day he first presented he wasn't able to run due to the pain in his feet and shins. With stretches, exercises, technique training and prescription orthotics, he was able to go on to almost painless half-marathon running.
Contrary to the popular opinion that strengthening your feet will fix everything ( and we always encourage our patients to do so), ask anyone with a significant degree of ligament laxity how effective this advice is alone, and how much running and walking hurts regardless of what exercises they do.
For patients with ligament laxity (double jointed in layman's terms) in their feet, prescription orthotics can allow them to participate in sports and activities they would normally just have to avoid.