What does the word calisthenics mean?

Usage examples for calisthenics

  1. Whenever nature does need encouragement calisthenics of some kind are advisable. – The Prospective Mother A Handbook for Women During Pregnancy by J. Morris Slemons
  2. In addition to calisthenics, there were courses in music, poetry, diction, philosophy, politics, and art. – Historia Amoris: A History of Love, Ancient and Modern by Edgar Saltus