physical exertion is a noun meaning "the activity of exerting your muscles in various ways to keep fit". It carries one recorded sense.
the activity of exerting your muscles in various ways to keep fit
“the doctor recommended regular exercise”
“he did some exercising”
“the physical exertion required by his work kept him fit”
Definitions, synonyms and semantic relations for physical exertion come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.