SelfGrowth.com notes that the Iron Gym pull-up bar allows the user to do pull-ups at home. Military.com explains that doing pull-ups, to exhaustion, three times a week should yield obvious results, and an increase in arm strength, in just a few months.
SelfGrowth.com reports that, in surveys, users of the Iron Gym pull-up bar agree that it produces fast results; however, the results depend on how often the product is used. One user reports taking two months to improve from two to seven pull-ups per set. Military.com reports that most people can progress from zero to 10 perfect pull-ups in a few months.