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veen  ·  499 days ago  ·  link  ·    ·  parent  ·  post: Pubski: October 3, 2018

You put it between your upper legs, as high as feels comfortable (i.e. in a position where you can hold onto it with keeping your legs together). It's usually asymmetrical in shape, the bigger half should be on your belly side. One can get similar results with a foam plank if you want to try it out, but those are much harder to keep between your upper legs.