I was on the stationery bike at the gym and the trainer came and talked to me and my husband. He said to really get in shape, no bike, no tread mill but cardio. Do exercise where you move and use weights is the best exercise. At the gym there is a back room where all the body builders go and he said they may be able to lift weights but most are in terrible shape because they don't move
their body. Thought I would share this. He also said walking is not good for a lot of women with bone problems. My advice is also ask your own doctor first about everything.