Also if you are overweight or just unfit, door frames are a great way to low stress train, do squats in the doorway with you hands on the doorframe, it's not a full range of motion, but it's a good way to spread the load between your arms and legs. You can do the same thing with a pull-up bar. I've seen large people get good results using that method to build strength before being able to do regular pull-ups or squats.
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