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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.
The bridge exercise is considered a basic rehab exercise to improve core and spinal stabilization. It's considered to be a safe exercise for those with back issues. If you sit all day, as many people do with a sedentary job, waking up your posterior chain can help with posture.