Normal size arches

There is even distribution from the front of the foot.

Less likely due to effective shock absorption, but neutral runners are not immune to injury.

The foot lands on outside of the heel, then rolls inward (pronates) to absorb shock and support body weight.

Low arches or flat feet

Big toe and second toe do majority of the work.

Shin splints, plantar fasciitis, bunions, heel spurs.

The foot lands on outside of heel, then rolls inward (pronates) excessively, transferring weight to inner edge instead of ball of the foot.