I am extremely over weight.  I am 5'2" and I weigh 259 lbs.  At this height and weight I am as round as I am tall.  Both of my knees are bad and I cannot even walk as my knee caps will slide /roll and try to pop out of the socket.  I was told to swim but I do not have access to a pool (I cannot afford memberships).  What type of exercises can...

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