青少年田径成绩为何突飞猛进？

A couple of years ago, my teenage son decided to spend the long New York winter running indoor track. An accomplished soccer player, he joined the team with the modest goal of staying fit during his main sport’s offseason, but before long his competitive streak kicked in. He trained like a demon for two months straight, brutalizing his legs and lungs with high-intensity workouts. The suffering paid off: His time in the 1,600-meter run (just shy of a mile) dropped so much that he earned a spot in our sectional championship, competing against runners from three nearby counties. My son had the race of his life at sectionals, shaving several seconds off his personal best. He also got absolutely smoked. …