This was Derek 's first judo competition and he was in a division where he was the only white belt .
Smash Gyms Kids Martial Arts students , Derek and Aaron Jen , competed this past Saturday at the San Mateo Boys and Girls Club Judo Development Tournament .
This was Derek 's first judo competition and Derek was in a division where Derek was the only white belt .
Smash Gyms Kids Martial Arts students , Derek and Aaron Jen , competed this past Saturday at the San Mateo Boys and Girls Club Judo Development Tournament .