How well do you rollerblade?

Will science ever be able to reliably and validly test how well you can rollerblade? According to the 2016 study, Reliability and Validity of the Inline Skating Skill Test, yes! Now, I don't know how "reliable" and/or "valid" this test actually is, as their study only tested 46 rollerbladers, and—and this is where the dubious wheeled-shoe drops!—the very first line of the introduction refers to rollerblading as "The roller sport"! Also, the authors admit that further study is needed into the accuracy of their rollerblading skill testing test, and that they would like to test it on "different populations including elite inline skaters." I'm not sure if I'd call Chet, Dave, and Marcia a "population", but damn they are good at figure eights!