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I saw an instructable for a TRX under $25 that suggested It could be made of paracord, I took that as challenge and made seven of them, for Christmas gifts. Each was under $9. So, to start you'll need to gather three materials: Paracord, Handles, and Carabiners.
Step 1Knots of fun
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The next thing you need to acquire is knowledge and skill in knotting. You need to learn and execute four knots, the lark,s head, the bowline, the constrictor knot, and the rolling hitch. The constrictor knot is also known as the constrictor hitch on one site so be aware. You need not become facile in their application, but for your own safety you should tie them tightly and efficiently.There are several sites with pictures or animation, of methods to use these knots and hitches.
It's cord.
Have you any pictures of this being made?
L