When your feet hit the trail, asphalt, or ball court, they take a beating with every step. Don't wait until foot pain cramps your speed, strength, and style -- learn the basics and finer points of foot care now. Foot expert and ultrarunner John Vonhof discredits the conventional wisdom of "no pain, no gain," teaching instead how the interplay of anatomy, biomechanics, and footwear can lead to happy or hurting feet. With a focus on individual and team...