Jack doing a backflip

A backflip was a gymnastics move.

In 2374, Jack demonstrated his ability to do a backflip to Julian Bashir, asking him if he could do the same. The doctor then answered him saying "I doubt it." (DS9: "Statistical Probabilities")

In 2377, Harry Kim complained that his stomach was full of alien parasites doing backflips. (VOY: "Workforce")

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