Fight Like a Girl is a Manga/Manhwa/Manhua in english language, Manhua series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Troy Qi was a young MMA world champion, crowned the strongest man in the world after a career-defining match. But his reign abruptly ends after he saves the life of troubled high school student Tori He, as she accidentally falls from a rooftop balcony. When Troy awakens, he finds that he died... and his soul has transferred into Tori's body! Now the world's strongest fighter must face his greatest battle yet: being a female fighter in high school.