This board is pretty much what I expected and was looking for, and I use it indoors and out, it seems to be fine on any surface. The black surface is pretty rough, so I don't recommend trying it barefoot, but it does work to keep your shoes from slipping when you stand on it. The only thing I was a little disappointed with was the guide that accompanied it, I was expecting a greater variety of exercises and/or a video to show a workout, but I guess you can find that on the internet...
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