the.com/calisthenics

Proof you don't need a gym, just gravity and a grudge against your own excuses.

means Bodyweight exercises — push-ups, squats, jumping jacks and the like — done to build strength and fitness without equipment.

from From Greek 'kallos' (beauty) plus 'sthenos' (strength) — literally 'beautiful strength.' The word was coined in the 19th century as a genteel term for physical training, originally aimed at promoting graceful, healthy movement rather than bulk or brute force.

etymology
Greek kallos and sthenos: beauty and strength
equipment
a bar and body weight outperform most machines
skill ceiling
planche and front lever take years, not weeks
origin era
used by ancient Greeks to train soldiers
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