Winner: Brooks Infiniti 2
Brooks' biodegradable MoGo midsole helps stabilize your foot when it overpronates (turns inward) slightly as it strikes, and a special fluid in the heel and forefoot enhances cushioning, reducing impact. "The shoes felt stable, not clunky. I could tell that they're built to encourage correct form," Swanson says ($125, brooksrunning.com).