As soon as a student becomes a student in LIS, he/she is allocated a School Sports House to which he/she belongs throughout his/her school career. The first thing he/she will notice is that the fierce competitive spirit in the classroom spills into the field. House spirit is evident throughout the year as the main co-curricular events are all house-based, but the time where it is strongest is during the Annual Games Carnival week and Annual Sports Day where it culminates in the March Past, Cheerleading and House Decoration competitions. The houses are entirely run by LIS students with very little intervention, if any, from the teachers. It is during this time that creativity, organisational skills and ability to work in teams are tested and the results are put in full display. The atmosphere is festive and tension-filled, but always highly enjoyable.
LIS students also participate in inter-school competitions – soccer, netball, badminton, table-tennis and tennis to name a few. LIS is always among the top schools at swimming in Wilayah Persekutuan for both the Primary School and Secondary School teams.