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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.
According to NINDS, exercises that strengthen back muscles may be the most effective way to combat lower back pain and speed recovery. In addition to practicing the exercises in this slideshow, get into a routine of other exercises that may improve lower back pain, such as walking, swimming, stretching, and yoga.