Pushed to his limits by Donquixote Doflamingo, Luffy coats his arms in Armament Haki and blows air into his muscles. This "Boundman" form greatly increases his physical power, speed, and elasticity, allowing him to fly by kicking the air.
In , titled "Gear Fourth! The Phenomenal Boundman!" , the Dressrosa arc reaches its climax as Monkey D. Luffy unveils his powerful Gear Fourth transformation for the first time. Key Highlights of Episode 726 One Piece Episode 726
Despite Doflamingo's laughter at the "bouncy" appearance, Luffy immediately demonstrates the form's raw power by landing a Kong Gun , which sends Doflamingo flying across Dressrosa into the city below. Pushed to his limits by Donquixote Doflamingo, Luffy
This power was developed during Luffy's two-year timeskip training on Rusukaina under Silvers Rayleigh to combat the island’s massive, aggressive beasts. Context and Reception The Phenomenal Boundman
Luffy reveals high-speed, unpredictable attacks like the Python , where his punches zigzag through the air to relentlessly pursue his target.