physical exertion vs physical exercise

physical exertion and physical exercise both are nouns.

Word	Noun	Adjective	Verb	Adverb
physical exertion	Yes	No	No	No
physical exercise	Yes	No	No	No

As nouns, physical exertion and physical exercise are synonyms defined as:

physical exertion and physical exercise: the activity of exerting your muscles in various ways to keep fit

Other synonyms of physical exertion include exercise, exercising, workout.

physical exertion (noun)	physical exercise (noun)
the activity of exerting your muscles in various ways to keep fit	the activity of exerting your muscles in various ways to keep fit