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You don’t need to have full mobility to experience the health benefits of exercise.
If injury, disability, illness, or weight problems have limited your mobility, there are still plenty of ways you can use exercise to boost your mood, ease depression, relieve stress and anxiety, enhance your self-esteem, and improve your whole outlook on life.
https://www.helpguide.org/articles/healthy-living/chair-exercises-and-limited-mobility-fitness.htm