I would like to build a small hoop-type run light enough that I could move it myself around the lawn so my chickens can get some greens. I'm planning on a base of 2 x 4's, maybe 4' x 8' or 6' x 8' and I would like it to be tall enough that I could easily get inside it--maybe 4' or 5'. My question is what would I use for the hoops that's light and flexible enough to be bent without equipment?