Stance too wide for my petite frame

I bought the smaller mat, because I am 5'1". Because of the design of the mat, the stance is still too wide for my frame. I can stand with both feet on one side of the raised portion in the middle of the mat that is supposed to inspire movement. It inspires movement in that I can't get comfortable so I am always moving trying to get comfortable. I end up with low back pain. I find that I want to trip on the raised area on the back of the mat. I bought this to use with the new sit/stand Varidesk.

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