Angling teaches a man patience and self control; (fox) hunting improves not only good horsemanship, but pluck and observation; whilst shooting inculcates quickness of hand and eye coupled with endurance and the power of bearing fatigue; football, cricket, rowing, rackets, tennis all bring to the front and encourage qualities that are essentially manly; and perhaps no sport tends to combine all these lessons so much as polo, none makes a man more a man than this entrancing game, none fits him more for the sterner joys of war or enables him better to bear his part in the battle of life.”    – J. Moray Brown, Badminton Library of Sports and Pastimes, 1891

And, while you are at it, check out the new United States Polo Association website.