Standing on one leg while performing a vertical split.
Not to be confused for a high kick or axe kick.
In October 2020, the pose became a Twitter meme under the hashtag #I字バランス部 ("#I-Shaped Balance"). It originated with post #4129230 and post #4119640; see comment #2047996 for details.
This tag implicates split and standing_on_one_leg (learn more).
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