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Yes you should exercise to try and prevent muscle atrophy IF you are able. Those exercises need to be low impact, for instance swimming, walking, yoga, tai chi, etc. You need to avoid impact exercises such as anything that involves jumping, bouncing, bumping, or jarring of the neck or spine in any way. Avoid roller coasters and trampolines and chiropractors unless they are specifically trained to deal with these conditions. Do not use traction at a physical therapist office. Also, consider hobbies such as gardening, even if you need an upright garden that stands at your level for less stooping. Working with PT on balance and posture exercises is good as long as it doesn't aggravate other conditions such as Tarlov cyst disease or tethered cord syndrome.