A subtle forward lean can go a long way because it pushes your body-weight forward, aligning it closer to initial foot strike position. In this way, the distance between your center mass (upper body) and initial foot strike position shortens which in turn can reduce the amount of braking per step. Less braking means less risk of bony injuries, runners knee and the painful lower leg condition chronic exertional compartment syndrome. A slight forward lean also seems to be a normative posture position found across most professional distance runners, especially from East Africa. Read more here about the other mechanical corrections proved to be effective in sustaibly reducing over strain from the lower leg during running.
BSc Neurobiology; MSc Biomechanics candidate, ultra minimalist runner & founder of RunForefoot. I was a heel striker, always injured. I was inspired by the great Tirunesh Dibaba to try forefoot running. Now, I'm injury free. This is why I launched Run Forefoot, to advocate the health & performance benefits of forefoot running and to raise awareness on the dangers of heel striking, because the world needs to know.