+1 Here I frequently hang from 4x4's at home under my deck. The key is the top bracing. I would avoid using 2x4's for top bracing as you will most likely have some deflection and the wood is going to weather. Source a 21' ( or 2 sticks of 10' and a connector) piece of chain link fence top rail and cut it to fit. A home box store will have the 10' sticks outside with the fencing. If you wish to have a one piece solution, you will have to go to a fencing supplier for the 21 footer. There are any number of ways to attach it between posts. The top rail is what is used on the DIY stands and it works well. Won't rot and possibly come down on your head.
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