The Contortionist's handbook v.2.0http://wandererstraining.com/tchb/
when she started doing gymnastics. An other example is Helena. She only uses assisted stretches and you can judge from the result yourself. The picture to the right is her backben
Suetonius • Life of Nerohttp://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Nero*.html
is in music, 33 gymnastics, and riding, which he called the Neronia ; at the same time he dedicated his baths and gymnasium, 34 supplying every member of the senator
An English translation, linked to the original Latin text. Part of a very large site on classical Antiquity, with many other ancient works.
That's everything I could find.
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