I think they're should be another additional stat called "stamina".
Would play a part in the formula of stat gains maybe even INT gain.
Depletes on every physical action including gyming, attacking etc.
Recovers like energy and life.
Maximum stamina can increase on leveling
If attacks are allows to take a good portion of stamina away, and prevent attacking when there is not enough stamina, this could actuslly solve a lot of issue for territory wars! Would favor "participation quantity" over "solo factions" that have the biggest players.
I think they're should be another additional stat called "stamina".