Speed is a players top speed, Initial is a player's initial speed, Accel is how fast a player will reach top speed (a LOWER number here the better), Power is a player's ability to break/make tackles quickly, Special for kickers determines how far they can kick, and for QBs is an average of how fast they throw the ball to their receivers. Stat 1 and Stat 2 are the in-game stats (TD, yards, INTs, etc.)