Checkmat Riverview Brazilian Jiu-Jitsu (BJJ) Adults and Kids Martial Arts in Gibsonton, Florida is a jiu-jitsu gym that offers training for both adults and children. The gym has experienced instructors and welcomes practitioners of all skill levels, creating an environment where both competitive athletes and hobbyists can train together. However, some parents have raised concerns about supervision and handling of conflicts between children of different ages during youth classes.