To writhe (verb): to twist, wring, or contort (a part of the body)

From the Proto-Germanic *wrīþaną, meaning twist or turn.

Agony (noun): extreme mental or physical suffering, particularly that of Jesus Christ in the Garden of Gethsemane.

Derived from the Greek agonia, meaning struggle for victory, or in a more general sense, exercise or gymnastics.

eurogamer.net/articles/2015-06-10-neymar-is-on-the-pes-2016-box

Evolution of meaning to include sense of pain so severe as to cause struggling occurred around the turn of the 17th century.

https://wittyfutty.com/2018/07/gif-neymar-bizarre-play-acting-after-layun-stomp/