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Don't underestimate walking as a cross-training tool. Walking is gentler on your joints than running, but it still works your muscles and promotes circulation in the legs and feet. Walking can help you maintain a basic level of fitness if an injury keeps you from running. I think of walking as a restorative activity; if my legs feel sore after a long run, I have found that a one-mile (or 20-30 minute) walk later that day or the next day helps relieve the stiffness and soreness.