Running injuries of the lower extremities are more frequent with increasing intensity and extent of training. Biomechanical investigations demonstrate that exertion induced injuries of the foot, achillotendinitis, patellar tendinitis and shin splint syndrome are correlated with disorders in footstrike patterns. Therefore running shoe insoles can eliminate peak forces by exactly placing supporting elements. Furthermore peak forces may be distributed and complaints may be reduced. 50 runners with exertion induced injuries of the lower extremity were provided with appropriate running shoe insoles. There were excellent results in 34% and good results in 42%. 20% had moderate improvements while only 4% had unchanged complaints.