Fifteen current and former Mexican fighters gathered to teach the biggest ever boxing class at the Zocalo, Mexico City’s main square, on Saturday.

Erik “El Terrible” Morales, Andy Ruiz Jr., Oscar Valdez, Jackie Nava, Humberto “Chiquita” González, Miguel Berchelt, José “Pipino” Cuevas, Alfonso Zamora, José Luis Bueno, José Antonio “Jaguar” Aguirre, Ganigan Lopez, Adrian “Confesor” Hernandez, Mariana Juarez, Ana Maria Torres and Alan David Picasso were the instructors of the mega boxing course organized by the Institute of Sports (Indeporte) in Mexico City.

The event broke the Guinness World Record for the largest boxing class in the world with 14,299 participants. The previous record was held by Moscow, Russia, which held a mega boxing class with 3,250 attendees in Red Square.

Participants wore T-shirts in the colors of the Mexican flag to cover the entire square in green, white and red.

Javier Hidalgo Ponce, director of Indeporte, presented the shirts just a few weeks ago.

“It will be a big multicolored party because together we will form the Mexican flag with these beautiful shirts that each of the participants in the Massive Boxing Class will have,” Hidalgo said on June 3.

The class lasted 30 minutes, with just two 20-second hydration breaks.