What is what episode is gear 4?

Gear 4, also known as Boundman, is a transformation that Luffy from One Piece achieves during the Dressrosa arc in the anime series. It is the fourth and most powerful transformation of his Devil Fruit ability, the Gomu Gomu no Mi. This transformation significantly enhances Luffy's speed, strength, and durability, allowing him to fight against powerful enemies such as Doflamingo and Charlotte Katakuri. Gear 4 is visually distinct as it gives Luffy a muscular physique with steam emitting from his body. This transformation is first showcased in episode 726 of the anime.