There is a sense of camaraderie when walking into Master Joseph Rivera’s studio at 7 Star Taekwondo. Young kids lie on their backs on chairs, concentrating on their books or devices. As children start gathering for a 4 p.m. class with their parents on the sidelines, the Yuba City dojo becomes noisy and bustling. For five members, it’s a family-like feeling that they attribute to qualifying to ...