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On rest and recovery days it is important to avoid doing the worst thing you can do for your body... nothing. Examples of rest and recovery activities are walking, static stretch exercises (after a warm up and loosening up period), dynamic stretching, swimming, water running, and riding a bike.
2 doctors agreed: Running: Running is a good form of exercise and can definitely help you lose weight. However, it is a high impact exercise and can damage your knees. Any form of cardio exercise that gets your heart rate up is good. Biking (or stationary bike), elliptical machine, rowing, swimming are all great forms of cardio.