MagneTrainer ER Mini Exercise Bike Exerciser
My family loves this little bike so much I had to order another one! You can use them with any chair under any table or desk with no problems. It is light enough that you can easily haul it from room to room yet sturdy enough I let my son carry it around.
My grandparents came to visit over the holidays and they liked using it on the table for their arms. My grandfather recently lost a leg due to illness and he is having to work very hard to maintain his upper body strength. He used it at my house over the holidays and has now purchased one for himself. It is really helping him.
My son sits on the edge of his bed and pedals it while he plays his video games. No more yelling for him to go outside and get some exercise.
I am getting everyone I know one for Christmas next year.