When the string player causes small pitch fluctuations by rocking the left hand while pressing the string down, it is called: ?

I think you are talking about vibrato. Vibrato- creating vibration in pitch or volume of a note. String players use their left hand to make these vibrations. Example: cellists usually use arm vibrato which is where the rock not only hand but also their arm to make the vibrations (violins usually only rock their hand).

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not because of any physical definition – as you can see cheerleading meets all of the athletic specifications. but, because cheerleading’s primary purpose is to support high school and college athletic teams. competition comes second! in other words, cheerleading is more than a sport.

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