PVC is popular as well but the problem I find with it is that it is too smooth not to rough. I find that it is hard to actually roll on the PVC I end up sliding up and down it because there is no grip on it to roll with my body. I think what you were referring to above is that it might be too hard but I don't think it is too hard.
PVC with some sort of rubber grip wrapped around it would be ideal if anyone has any ideas.
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