Nøkkelord Gymnasium

Peter La Fleur er innehaver av Average Joe's Gym, et slitent treningsstudio som er base for en rekke eksentrikere og er på konkursens rand. Over gata ligger det superhippe Globo Gym, eid av ekle White Goodman. Han er selvsagt ute etter å knuse konkurrenten. For å berge Average Joe's Gym finner en av gutta ut at de kan delta i en konkurranse, og prispengene vil nemlig kunne dekke gjelda. Men White Goodman gir seg ikke uten kamp.

Yan Yifeng died after suffering a heart attack in a mixed martial arts match against Thai boxer Desri. His death devastated his father, Yan Dongshan, causing him to give up on his martial arts school. 12 years later, Desri returns to challenge Dongshan. Dongshan takes him on, only to be badly defeated. His daughter Yichen and disciples Zhengbing and Shuya decide to come together to help Dongshan revive his martial arts school to take revenge.