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Most gyms have pull up machines that allow a sort of spot. You set a weight and then put your feet on it. When you get tired, it helps you out. It is not as good as the real thing, but for people that have trouble doing them without help they still work the muscles pretty good.
There are also new machines out there that will really isolate them. Not sure of the name, but basically each arm has it's own weight assigned to it, so it makes it harder to cheat.
I think machines are almost better for 90% of the people out there because they make it easier for newer people to have proper form. The machines that don't allow you to cheat by one arm being stronger than the other are the best.
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