Joan Benoit Samuelson Targets a Sub-Three Hour Marathon—at the Age of 60

She has managed that with a regimen that gives new meaning to cross- training and will be music to the ears of runners who hate the labors of quarter and half-mile speed intervals. She says she hasn’t been on a track in two decades, fearing the turns will wreak havoc with an irritable “lower back and hip thing” that can aggravate the opposite knee and ankle if she compensates by altering her natural stride.