How is Johnny Cueto's 'shimmy' move when he pitches not considered a balk? - Quora

At about 8:37 into the video linked below, the announcer says 'he gets him chasing a slider as well back to back strikeouts'. What does 'slider' mean there? The link starts at

MLB's funkiest pitching windups

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Johnny Cueto shimmies 5 times before delivering strikeout pitch

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How is Johnny Cueto's 'shimmy' move when he pitches not considered a balk? - Quora

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How is Johnny Cueto's 'shimmy' move when he pitches not considered a balk? - Quora

Nestor Cortes goes with a funky windup to strike out Devers : r/baseball

Ranking the 10 Most Unique Pitching Motions in Recent MLB History, News, Scores, Highlights, Stats, and Rumors

How is Johnny Cueto's 'shimmy' move when he pitches not considered a balk? - Quora

Which pitchers have (or had) the most unusual form? - Quora

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