Duane Crespo is a retired U.S. Marine who says MMA saved his life -- and now he's gunning for the Power Slap heavyweight title.<br />“I was a disabled vet. Struggled walking, had speech problems and other medical problems. Martial arts saved my life and got me healthy.”<br /><br />Now, Crespo -- aka "The Iron Giant" -- is a force to be reckoned with ... demonstrating serious power at the Power Slap qualifiers and putting the entire heavyweight division on notice. <br /><br />“Anybody you give me, I’m fine with it,” Crespo says … “I can put ‘em down with one strike.”<br /><br />Crespo — who’s competed in several bare knuckle, MMA and Muay Thai fights — says his biggest professional influence is Kobe Bryant, who inspired him to take his training to the next level. <br /><br />“Mamba Mentality. First in the gym, last out.”<br /><br />#SlapFight #SlapBoxing #FaceSlapping #SlapContest #OpenHandCombat #MartialArtsSlapping #RussianSlapChampionship #PowerSlap #ExtremeSlapping #PainfulSlapTechniques