Nearly two dozen second-graders stand with one foot in front of the other, their hands balled into fists as they scream as loud as they can. Students at Oakwood Elementary School and Flowery Branch Elementary School have access to a new taekwondo program taught in the middle of their school day, thanks to a partnership between the public schools and a nearby martial arts school. “I proposed bringing a martial arts program into the public schools,” said Kwan Kim, owner of U.S. Elite Taekwondo Academy.