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Japanese Edutainment Show 老师没教的事 - Identify the variables in the video!

In this segment, the Japanese participants are asked to remove the creases in a piece of leather using the ironing method.
Although you may not understand Japanese, there is traditional Chinese sub-titles.
Can you identify some of the variables of the "experiment"?

How would you systematically design your experiment to determine the best set of criteria to efficiently and effectively remove the creases from the leather?
You may jot down the variables (or your comments) in the discussion forum.