Does stamina change significantly as a result of playing games? I've been tracking my players' stats on excel, and after this last game, about half of the players had different stamina's than before the game. Now I'm curious if this was because I entered them wrong, or if they really changed that much, in which case I feel silly for training one of my athletes in "stamina".

At least not through games. The only way stamina should change is through training.

So one of three things happened. You entered it wrong, you had a great week of training for stamina, or there's a bug.

Come to think of it, he could have meant that. I just assumed that since he said he was training a player in stamina, that it went up.