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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.
Figuring out which exercises to include in your exercise regimen to improve your overall general physical preparedness is a difficult task. One way to do it is to include exercises that will work your body in all the ways you might move your body on a daily basis. Using plane-of-motion exercises will help you do that.