Athleticism is not even a proper word. The suffix “ism” generally refers to a belief system like atheism or Communism, a condition like alcoholism, or a behavior pattern like heroism or colonialism; all three of these categories of “isms” involve behavioral choices made by a person or group of people; none refer to natural ability or any other inherent characteristics; there is no word where the suffix “ism” means “ability” or an extraordinary presence of its root prefix, in this case, the word “athlete;” what the guy who coined the word athleticism was searching for was “athleticity;” “icity“ or “ity” are suffixes designed to convert an adjective into a noun like “ethnic” to “ethnicity” or “elastic” to “elasticity;” not that I’m pushing for the word “athleticity;” like “athleticism,” it has five syllables; I recommend we stick with “athletic ability” in spite of its seven-syllable length, although I would welcome an intelligent, shorter word for it; for those who claim football people are illiterate morons, the use of the word “athleticism” is further evidence they might be right