Eating food should give you increased stamina regen/cap

[Frank_Stein]

Please make working out increase stamina.

I think the best way to do that would be that working out a few times gives you a little buff that lasts a few minutes, so that people will just make periodic trips to the gym if they want to maintain them. Same thing with whatever benefits food provide.

Certain drugs like steroids or traitor items like the wrestling belt could let you stack those buffs while making that window before they go away longer.