Calisthenics

calisthenics = body weight exercises

From the Online Etymology Dictionary:

Also callisthenics, kind of light gymnastics, 1842, (the adjective calisthenic/callisthenic, of exercises, was in use by 1837), formed on model of French callisthenie, from Latinized combining form of Greek kallos "beauty" (see Callisto) + sthenos "strength, power, ability, might" (perhaps from PIE root *segh- "to have, hold," on the notion of "steadfastness, toughness") + -ics.\

- https://www.etymonline.com/word/calisthenics