We went to the gym with a guy that could not walk. He would come in and do the weight machines for the upper body then use an arm bike to get his cardio. He said he used to be overweight and flabby but he was in excellent shape while we knew him.

My husband had to use an arm bike to recover from shoulder surgery. They are not expensive. They are just a portable exercise bike that can be set on a tabletop. His has different pedals to exchange for feet and hands. It might help you get more exercise in. Your Cubii may even be able to be set on a table and used for that purpose. Bands could also work in lieu of weight machines. Where there is a will there is a way.