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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.
These important exercises can make your labor easier and help you recover from it faster. To do 'em, hold your down-there muscles (as though you're trying to stop peeing) for up to 10 seconds, then slowly relax. Repeat in sets of 10; work up to 10 sets a day.