Hopefully, this will help the starving college students out there save some much needed mula. What you need to make durable gymnastics rings is PVC pipe (1-2 inch), A large pickle jar (the kind you buy at Sam's that could feed a small orphanage for 6 months), 1/4 inch rope, duct tape, sand, an oven, and some thing to string the rings from a rafter - I use adjustable cargo ties.
Directions:
Measure the circumference of the pickle jar and cut the PVC pipe 2 inches short of that measurement.
String the 1/4 inch rope through the PVC pipe.
Stuff sand into the pipe with the rope still in it very tightly and duct tape the ends shut.
Preheat the oven to 300*
Put the PVC in the oven for 8 minutes.
Take the PVC pipe out and wrap it around the pickle jar. Tie the end of the ropes to hold it tight.
Let it sit for 15 minutes or until cooled off.
Empty the sand and tie ends of the rope well and you have some great gym rings.

http://www.thechangeblog.com/2008/07/29/working-out-alone

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