Tough Guy

 is a perk in Fallout: New Vegas. Repeatedly breaking bones has led them to become stronger.

Recommendation
Hurt yourself with mainly Explosives (landmines, grenades, C4 explosives), one explosive is more then enough at certain times and without armor, quickest way to cripple limbs, just be sure to survive the explosion by backing up a certain distance but close enough to 'take it.' While doing this also go to a nearby doctor for full health and repeat.

Having both the Adamantium Skeleton and Toughness (2 ranks) perks takes longer to complete the challenge.