How can I build a support for doing chin ups and inverted sit ups? Not on a door frame?
What materials do I need and how it can be built without welding? My doors and walls can not stand it when they need to build independent support.
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I use a device called a power tower. I bought it new for $150. Here is a link to something similar. If nothing else, it will give you an idea of how to fabricate something similar from components purchased at Home Depot or Lowes.
http://www.nextag.com/Icon-Health-Fitness-200-559789820/prices-html