One Piece, the Empress' Personal Trainer

Traveling through the world of pirates, you were captured by the empress Hancock at the beginning! My name is Chu Yunjin, a fitness coach. I thought I would be the mascot of Daughters Island for the rest of my life. Until I discovered that the empress' training method was full of mistakes! "Empress, your core is unstable and your domineering power has been leaked too seriously!" "And you, the way you use your fragrant feet is wrong, it can easily hurt your waist!" Awakening the extraordinary physical skills tutor system, I bring modern science to the great route! Hancock: I thought he was the weak one, but I didn't expect that he is the "overlord" of my concubine! Nine Snake Warriors: Coach Chu's "butt lift and muscle building" training has increased the power of my kicking skills tenfold! When the war broke out on top, the Nine Snakes Legion that I had specially trained appeared on the scene. The naval marshal Sengoku was completely confused when he saw that he kicked a pacifist female warrior! "Where did these monsters come from?!" Chu Yunjin: "Don't ask, asking is science!" Years later, someone asked Kaido, the strongest creature in the world, who was the enemy he least wanted to face. Kaido cried: "It's the coach named Chu Yunjin. He forced me to do aerobics!"