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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.
While we often focus on getting in as much exercise as possible, rest and recovery are also essential for reaching your weight loss and fitness goals. While you can often do cardio every day (though you may want to rest after very intense workouts), you should have at least a day of rest between strength training workouts.