My two cents: Really athletism should be removed from the game as an attribute, and replaced with strength AND agility. If the engine still needs athletism for its computations, the score should be derived from that player's combination of speed, strength, and agility, as it would take scores in all three to be considered highly "athletic". However, a player could still be moderately athletic by having high scores in two of the three. such as fast and strong, but not agile (a good PF perhaps), or strong and agile, but not fast (a great center), and of course fast and agile, but not strong (your typical guard). Put all three together and you have your stud SF.
This would also add to the individuality of each player, and the "inferred" part of the game. A rebounder who is fast and strong would have good athletism and gets his boards by beating his man to the spot and outmuscling him. My strong and agile rebounder has the same derived athletism but he gets his boards by spinning around a defender and boxing out better. Meanwhile my weak little guard who is fast and agile gets all those long rebounds, while still having the same inferred athletism.
In the meantime, while holding my breath for this change, I will assume that the athletism score can mean EITHER strength or agility, or a combination of the two, depending on the type of player. For my 5'8" guard I will assume that his high athletism means he is very, very agile and can jump out of the gym. Meanwhile for my 6'10', 260 lb center, I will assume that his high athletism means he is very, very strong with great hands.