Acceleration is how quickly a player can reach top speed (pace) from a standing start. It therefore ties in very closely with the Pace attribute.
Agility reflects how well a player can start, stop, and move in different directions at varying levels of speed (pace). It ties in with the Pace, Acceleration, and Balance attributes as they work together in the match engine, especially when a player is running with the ball.
Balance reflects simply how well a player can keep his balance in situations both with and without the ball. With the ball, it refers to how balanced he is running with it and evading opponents, without it, it refers to his balance when facing a player running at him, or his stability when turning/jumping.
This attribute relates to how high a player can jump from a standing start.
How fit a player is as standard – his base level of fitness. It affects how many games he is likely to be able to perform to peak physical fitness in before becoming noticeably tired and susceptible to injury.
Pace is a player’s top speed. Whereas Acceleration reflects how quickly a player can attain their top speed, pace is that top speed and together with Stamina and Natural Fitness, is how long they are able to maintain that pace in both short bursts and over the course of a match. A player will naturally be a shade quicker without the ball than with it.
Stamina is a player’s ability to endure high-level physical activity for a long period of time. With the demands placed on a player over a nine month season, players with high attribute ratings for Stamina will be able to perform at their top levels for longer. It ties in directly with Natural Fitness.
A player’s strength is his ability to exert his physical force on an opponent to his benefit. A player with a high strength rating will be able to use it to his advantage against weaker opponents.
FM 14: Player Attributes 4 (Physical Attributes)