Exercise

Exercise is the performance of activities in order to develop or maintain readiness or competence in various forms of endeavors. Prominent among these are physical exercise engaged in for physical fitness and skill, mental exercises for mental fitness and readiness in various fields, and military exercises for readiness in regard to war.

Quotes

He who knows how to move around becomes strong. He will live longer than the sedentary man.
- Sumerian proverb, Collection II at The Electronic Text Corpus of Sumerian Literature, 3rd millennium BC.

If you would get exercise, go in search of the springs of life.
- Henry David Thoreau, "Walking" (1862), in Writings, vol. 5 (Houghton Mifflin, 1906), p. 209