After-school sports competitions are very important at HIS. High schoolers (and sometimes middle schoolers) have the option of playing volleyball and/or futsal during the first semester, with basketball second semester. Dependent on the number of participants, there are usually Varsity and Junior Varsity teams for guys and girls. Players practice two hours after school every other day and play teams from clubs and local schools on Fridays.
High school classes prepare meals for the parent community during the Friday night games to fund their senior trips.