Fortitude

Fortitude is the measure of your physical resilience. Level one of this perk gives 200% headshot damage to fists and machine guns. Levels 2-8 increase headshot damage by 10% and chance to dismember by 5%. Levels 9 and 10 increase headshot damage by 15% and dismember chance by 5%. It's split into three subcategories with various perks related to weapons, survival, and recovery.

Level	Rank	Rank Description	Cost
1	Fragile Health	You aren't very durable or healthy but at least you are alive. Deal 200% head shot damage and have a 5% chance to dismember with fists and machine guns.	-
2	Sickly	You feel a little better than you used to. Deal 210% head shot damage and have a 10% chance to dismember with fists, and machine guns.	1 PT
3	Unhealthy	You continue to defy gravity and keep standing. Deal 220% head shot damage and have a 15% chance to dismember with fists and machine guns.	1 PT
4	Weakened	You are starting to feel like normal people. Deal 230% head shot damage and have a 20% chance to dismember with fists, and machine guns.	1 PT
5	Hardy	You are in good health. Deal 240% head shot damage and have a 25% chance to dismember with fists and machine guns.	1 PT
6	Very Healthy	You are very healthy. Deal 250% head shot damage and have a 30% chance to dismember with fists and machine guns.	2 PT
7	Vigorous Health	You have vigorous health. Deal 260% head shot damage and have a 35% chance to dismember with fists and machine guns.	2 PT
8	Resilient	You are as resilient as they come. Deal 270% head shot damage and have a 40% chance to dismember with fists and machine guns.	2 PT
9	Amazing Constitution	You have an amazing constitution. Deal 285% head shot damage and have a 45% chance to dismember with fists and machine guns.	3 PT
10	Exuberant Fortitude	You have exuberant fortitude and can put a beat down on a tornado. Deal 300% head shot damage and have a 50% chance to dismember with fists and machine guns.	3 PT

Perks

Combat Perks
The Brawler	Learn martial arts and use your fists to stun, knock down, disarm and ragdoll your opponent.
Machine Gunner	Become a commando using automatic weapons to slay your foes.
Lightning Hands	Pulverize your enemies with faster brawling strikes.
Survival Perks
The Huntsman	Specialize in hunting your prey and harvesting more meat, bone and leather.
Pain Tolerance	Specialize in shrugging off blows, fighting through pain and staying in the fight when others would be down for the count.
Fortitude Mastery	Fortitude Mastery Skills
Recovery Perks
Siphoning Strikes	With every hit, you take a piece of them.
Healing Factor	Specialize in boosting your natural healing rates as long as you're not starving.
Iron Gut	Specialize in gastrointestinal health to use less calories and gain more benefits from food. Use less oxygen while diving.
Rule 1: Cardio	Train your body in number one tactic against the zombie menace: Running away from them.