callisthenics vs exercising

callisthenics and exercising both are nouns.

Word	Noun	Adjective	Verb	Adverb
callisthenics	Yes	No	No	No
exercising	Yes	No	No	No

As nouns, exercising is a hypernym of callisthenics; that is, exercising is a word with a broader meaning than callisthenics:

callisthenics: light exercises designed to promote general fitness
exercising: the activity of exerting your muscles in various ways to keep fit

Other hypernyms of callisthenics include exercise, physical exercise, physical exertion, workout.

callisthenics (noun)	exercising (noun)
the practice of calisthenic exercises	the activity of exerting your muscles in various ways to keep fit
light exercises designed to promote general fitness