Fine rope for something, but not really for climbing

I wanted to put in a rope to practice climbing for a Spartan Race. This rope is certainly long enough and the right diameter, however it is a very slick material and is therefore very difficult to climb. Even my feet with grippy sneakers cannot find purchase on the rope using either the j-hook or s-hook method. Mud covered ropes at the race are easier to climb than this is.

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