Tags: 2mm, 4mm, bakila, best, best forefoot shoe, distance, distancia, ethan newberry, fivefingers, forefoot, free, ginger, gingerrunner, half, heel drop, marathon, marathons, minimus, motion, natural running, new balance, newton, newton distance, Newton Gravitas, nike+, review, runner, running, Science, shoe, shoes, sir isaac, terra momentus, trail, training, vibram, zero drop