Heel strike running is most damaging on our heels because the heel is the first point of contact on the foot where impact is significantly higher-than-normal. Conversely, in forefoot running, the heel is most protected from injury as the heel is the last part of the foot to contact the ground. In fact, damaging impact on the heel is barely measurable because most of the bodyweight has moved well ahead of the heel shortly after touchdown. Read more here about other areas of the body that heel strike running damages! 
Why Heel Strike Running is Bad for Your Heels
