Science tells us that by impact standards, a high collisional force as well as greater joint loading are consistent consequences of heel strike running. At faster running speeds, these impacts exceed tolerance, resulting in pain and fatigue because the body needs to continuously work harder to absorb the excessive impact. This is one of the many reasons heel strike running does not sustain well economically as well as for injury prevention. Read more here about how heel strike running has more negative forces at work on the leg as compared with forefoot running.
