Has anyone used the Orbitrek as their main source of exercise?

I just bought a used Orbitrek yesterday, only can do a minute or two before my legs feel like they are going to fall off. Has this exercise worked for you? What else did you do? I am four months out and down 73 pounds was going to the YMCA but just wasn't getting results hoping this orbitrek will help me strengthen my legs more have a bad knee. Thats for any advice you have.. Alicia

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