I would think strolling is moreso a new school thing. I wonder if Nupes actually strolled in the 70s. I could probably envision them doing it during the late 80s, definitely the 90s and beyond.
I know that step shows have been around for a long time, but the strolling and shimmying aspects probably started over the past 15-20 years. Although, I could be wrong on that.
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