What's the best rope?

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Does I04 and figure 9-1 really depict that a strap is a rope. Seem to eliminate difficulty and challenge of climbing a round gym rope. I admit I need more time to read and read again. At first impression I suspected the rope rule was going to be to have rope as similar to the 3 strand twisted rope depicted in the release videos.

Interpretation would be a 1/4 rope would be ok or 1" strap. The challenge is to engage the line and then is simply becomes a cable winch.