Question about Athleticism

So in my recent Streams When I watch the 2D games I see my players getting fatigues much faster than the opposition. Is that because of the Athleticism attribute?
Is athleticism: Speed, Agility, vertical, and Stamina all combined or are some or all of those stats hidden and independent which will mean Athleticism is something else?
My players getting gassed so quickly i just dont see how I can support 30+ mins like the other schools which I see them(perception will do more research) play 34 and still be in light green fatigue.
Is athleticism: Speed, Agility, vertical, and Stamina all combined or are some or all of those stats hidden and independent which will mean Athleticism is something else?
My players getting gassed so quickly i just dont see how I can support 30+ mins like the other schools which I see them(perception will do more research) play 34 and still be in light green fatigue.