Other Factors that Affect Training SpeedTwo important factors that affect training is height and age.
AgePlayers of all age will benefit from training. However younger players improve faster. That's why quite often, an 18 year old will often be prioritized in the drafts (of course, we also need to take starting skills and potential into account, since 19 year olds can have considerably better starting skills). To get a better idea of how much slower a player trains as they age, you can refer to this post:
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A player will also start to deteriorate in skills at the age of 35, just like how players get slower when they get older. As far as I know, the rate of skill drops is random (and which skill that drops), so there are times when you can get a double drop. To slow down this drop, you can get trainers with Career Extension specialty. Players above 35 can still be trained, although their skill drop rate will definitely outpace the skill training rate.
HeightHeight has no impact during matches. A short player can still consistently outrebound a tall player if their rebound skill is better. I know some people might say "how is that possible? The taller player doesn't even need to jump", but imagine a short player who can jump so high that they can catch the ball above the taller player's outstretched arms, or the taller player gets boxed out by the shorter player and is in a bad position to catch the rebound, or they just have butter fingers or bad coordination. Either way, height has no impact during matches.
However it does impact training a lot. A taller player would train much faster in rebounding than a shorter player, while a shorter player will train much faster in handling than a taller player. The equilibrium, where a player trains all skills at 100%, is at 6'7" or 201cm. Here is the list of skills and how their training speed is affected by height:
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Does that mean 201 cm players are the best? Not necessarily. For guards, shorter players are better because they train handling and outside defense faster. You would want taller inside players because they train inside shooting and inside defense faster. However, this isn't exactly set in stone because it all depends on context. A player who is around 6'9" could be a more ideal post player than a 7'2" player. I'll get into that later on when I talk about player builds.