AMHERST — Red Murdock slipped off his T-shirt and shorts, exposing his tattoo-covered washboard stomach. He crouched into a sprinter’s stance, adjusting until he felt just right. Murdock exploded out of his stance to the beeping tune of synchronized stopwatches and raced 40 yards downfield. Fifteen minutes later, he repeated the exercise. Moments later, Murdock attempted to perform the short, ...