Harvard: Lieberman Studies on heel strike

Lieberman: …most experienced, habitually barefoot runners avoid heel landing & instead land forefoot or midfoot strike….most FF & some MF strikes (shod or barefoot) do not generate the sudden, large impact transients that occur with heel strike (shod or barefoot). Consequently, FF or MF strikers do not need shoes with elevated cushioned heels to cope with sudden, high transient forces that occur when you impact.