Moderate exercise, insuring the right balance between mind and body, and the highest efficiency of performance, is, of course, a prime requirement.
 Nikola Tesla, The Problem of Increasing Human Energy (1900). copy citation

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Author Nikola Tesla
Source The Problem of Increasing Human Energy
Topic efficiency requirement
Date 1900
Language English
Reference The Problem of Increasing Human Energy with special references to the harnessing of the Sun's energy, in "Century Illustrated Magazine"
Note
Weblink https://en.wikisource.org/wiki/The_Problem_of_Increasing_Human_Energy

Context

“For instance, the mere development of muscle, as aimed at in some of our colleges, I consider equivalent to adding mass of "smaller velocity," and I would not commend it, although my views were different when I was a student myself. Moderate exercise, insuring the right balance between mind and body, and the highest efficiency of performance, is, of course, a prime requirement. The above example shows that the most important result to be attained is the education, or the increase of the "velocity," of the mass newly added.
Conversely, it scarcely need be stated that everything that is against the teachings of religion and the laws of hygiene is tending to decrease the mass.” source