“For physical fitness is not only one of the most important keys to a healthy body; it is the basis of dynamic and creative intellectual activity. The relationship between the soundness of the body and the activities of the mind is subtle and complex. Much is not yet understood. But we do know what the Greeks knew: that intelligence and skill can only function at the peak of their capacity when the body is healthy and strong; that hardy spirits and tough minds usually inhabit sound bodies.”
1960, Sport at the New Frontier: The Soft American
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John F. Kennedy 469
35th president of the United States of America 1917–1963Related quotes

“A sound body keeps a sound mind.”
Wise words from Frazier. http://www.nytimes.com/2006/10/18/sports/othersports/18frazier.html?pagewanted=2&ei=5090&en=a3509c26258f5380&ex=1318824000&partner=rssuserland&emc=rss

1900s, Address at the Prize Day Exercises at Groton School (1904)
Context: Remember that in life, and above all in the very active, practical, workaday life on this continent, the man who wins out must be the man who works. He can not play all the time. He can not have play as his principal occupation and win out. Let him play; let him have as good a time as he can have. I have a pity that is akin to contempt for the man who does not have as good a time as he can out of life. But let him work. Let him count in the world. When he comes to the end of his life let him feel he has pulled his weight and a little more. A sound body is good; a sound mind is better; but a strong and clean character is better than either.

In Zee News: I quit singles to prolong my career, says Sania http://zeenews.india.com/sports/tennis/i-quit-singles-to-prolong-my-career-says-sania_757389.html, 2 March 2013

“You should pray for a sound mind in a sound body.”
Orandum est ut sit mens sana in corpore sano.
X, line 356; see mens sana in corpore sano.
Variant translation: One should pray to have a sound mind in a sound body.
Satires, Satire X

Interview with Spa.com http://www.spabusiness.com/TP_counter.cfm?sitecode=SB&linktype=story&codeID=31102&viewtype=online

1960, Sport at the New Frontier: The Soft American

“Asanas keep the body healthy and strong and in harmony with nature.”
Source: International Society for Phenomenology, Fine Arts, and Aesthetics. Conference Harvard Divinity School) Gardens and the Passion for the Infinite, Volume 78 http://books.google.co.in/books?id=GuImRK8_SRAC&pg=PA87, Springer Science & Business Media, 31 January 2003, p. 87

Source: Books, Spiritual Warrior, Volume I: Uncovering Spiritual Truths in Psychic Phenomena (Hari-Nama Press, 1996), Chapter 1: Dreams: A State of Reality, p. 18-19