Seeker, if your doc says you need some exercise, by all means do it in water!
Arthritis has set in on some injuries I've had in the past and I didn't say anything until my knees hurt too bad to walk on. I was always told to exercise in a pool but I held off because I didn't have one until not too long ago.
My legs are sore, but the rest of me feels so good!! You should try it!
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.