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Runner-up: Avia i-Burn
Word on the Street: Designed with a double rocker technology that causes your heel and forefoot to sink and rise as you walk, the shoe "feels like walking at a five incline on the treadmill." "You feel every muscle in your lower body engage with each step," especially the outer thighs and calves, testers say. Because "they're so comfortable," one flat-footed tester was able to walk farther. ($120, avia.com)