Ideally, he said, one female pacer would be perfectly spaced in front, another in back, for the first half-mile; then another fresh-legged pair would step in to take their place at the half-mile ...

For instance, da Silva calculated that a 125-pound, 5-foot-7 female runner who typically runs about a 3:35-minute marathon could improve her time by as much as five minutes. A magic number For the new ...

For instance, da Silva calculated that a 125-pound, 5-foot-7 female runner who typically runs about a 3:35-minute marathon could improve her time by as much as five minutes. A magic number ...