Please help on statistics.

[LarryC]

No one knows.
It supposedly reduces the Condition loss (or at least the effect of it) during the game.

[....]

So...

No one knows.

also not clear how to make sense of fitness skill for positions like ST that have it as grey skill.

Edit: actually ST is the only position with Fitness as grey skill. Interesting, on the French-speaking forums someone made the link between this and the poor performance of STs (but that's another debate)