Sesame Street "Gymnast Segments" (partially found segments of children's educational TV series; 1973)
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The Gymnast segments are a series of inserts including a female gymnast (with blonde hair and wearing a black leotard) demonstrating various concepts using various gym apparatuses - like pommel horses and uneven bars - in a darkened, nondescript location. Two of the eight inserts featuring this gymnast - Around and Between - have resurfaced on YouTube; the six that haven’t are:
Beginning/End (uneven bars)
Close To/Away From (rings)
Over/Under (pommel horse)
Slow (uneven bars - slow motion)