At McGill University in Montreal, Steven Robbins, M.D., and Edward Waked, Ph.D., performed a series of tests on gymnasts. They found that the thicker the landing mat, the harder the gymnasts stuck their landings. Instinctively, the gymnasts were searching for stability. When they sensed a soft surface underfoot, they slapped down hard to ensure balance. Runners do the same thing, Robbins and Waked found: just the way your arms automatically fly up when you slip on ice, your legs and feet instinctively come down hard when they sense something squishy underfoot. When you run in cushioned shoes,
...more
