Tough Guy/Fallout: New Vegas

Tough Guy is a challenge perk in Fallout: New Vegas.

Effects
Repeatedly breaking bones has led them to become stronger (somehow). After crippling any limb (head, torso, arms or legs) a total of 50 times, limb damage reduced by 20%

Behind the scenes

 * This perk is based on Wolff's law, the practice of increasing the strain on a bone to make it stronger.