IPA: /ɪɡˈzɜːrʃən/
KK: /ɪɡˈzɜrʃən/
The act of using physical or mental effort to do something, often requiring strength or energy.
After a long day of exertion, she felt exhausted but accomplished.
Exertion → It is formed from "ex-" (meaning out) and "agere" (meaning to do or to act). The word "exertion" refers to the act of putting forth effort or energy, essentially doing something actively and forcefully.
Think of 'doing' something ('agere') 'out' ('ex-') — that's why exertion means putting forth effort.