Cardio?

How about riding a bicycle. You can do this indoors and this keeps the stress off the knees. I don't think a stationary bicycle should be that expensive.

It's great you're making an effort to do some exercise. 

Hi,

I think the simple answer is to use weights and rubber band resistance to work on all the muscle groups you can in ways that do not cause you knee pains and added problems. There are also a lot of gymnastic exercises (like push-ups) that you can do without any equipment at all. If you have no experience with training or training programs, you may want to find a professional coach to design a program for you.

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Good Luck from Knut

The couple answers I read are quite helpful.  Any movement you can do that does not effect your knees.  Upper body weights at a consistent pace.  Outdoor activities, raking, gardening, etc.  In addition, sexual intercourse several times per week can be a very good cardiovascular work out!

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