Every week, Sue and Kendra highlight local men and women who are making our city stronger with their big hearts, bold ideas, and that unmistakable Boston spirit. Today they talked with Ruan Oliveira. Ruan is a black belt in Brazilian Jiu Jitsu who has earned medals in the prestigious World Championship and the Brazilian National Championship. Today, Ruan is a BJJ instructor at Harvard and Boston University, and he’s working to grow his newly founded Collegiate Jiu Jitsu League.