I've heard this several times of the course of this year and wondered if the term "gainer" used to replace "backflip" was just slang or if there was actual reasoning behind it
Learn English – When and why did people start referring to back flips as “gainers”
slang
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Best Answer
This term is surprisingly old, dating back to at least 1905. It appears to originally be a diving term:
Here's another source from 1908:
I am not sure why it was called a gainer, but this at least answers the when.
The term would be adopted into other sports later on (like skiing and gymnastics) but diving is where it started.