The Champion (1979)

Fifth-grader Murat Batyrbaev grew up like a mama's boy, was often sick, was weak and indecisive. At school he got straight C grades and avoided physical education classes. One day, while skipping another lesson, he met a new student in the class, whose father was appointed a physical education teacher at their school. The friendship between Murat and Zhenard helps the boy to believe in himself, overcome his fears, enroll in the boxing section and win school competitions...