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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.
You also have to think of how many sets of each exercise you're going to do at any given intensity. Obviously the more sets you do, the more tired you're going to be. Factor #4: The Type of Exercise Matters. Don't ignore the type of exercise you are doing when considering the need for recovery.