Rule 1: Cardio

Train your body in the number one tactic against the zombie menace: Running away from them.

Ranks and effects

Rank	Requirements	Effect
1	Fortitude Level 1 Buy: 1 Point	Just put one foot in front of the other. Increase stamina regen by 10% when sprinting.
2	Fortitude Level 3 Buy: 1 Point	Leave your enemies in the rear view mirror. Increase stamina regen by 20% when sprinting.
3	Fortitude Level 5 Buy: 1 Point	Crush every mile with ease. Increase stamina regen by 30% when sprinting.
4	Fortitude Level 7 Buy: 1 Point	Outlast, outrun, outlive. Permanently add 25 max stamina.
5	Fortitude Level 10 Buy: 1 Point	The ultimate test of endurance is like a walk in the park. Permanently adds an additional 25 max stamina.