Aim Of Study: To investigate into core stability measures and to establish the priliminary normative datd in swimmers of Delhi.

Materials and Methods :  Three groups of freestyle sprint swimmers were studied: male swimmers (from Khazan Singh and Talkatora stadium, (n = 25), female swimmers from Khazan Singh and DPS school=25) and male adolescent swimmers (n = 20).They were subjected to 4 tests of core stability (muscular endurance of trunk flexors and extensors, and of left and right lateral bridge) at the beginning of the 2009/2010 season.

Results: Swimmers (elite) have higher trunk flexor endurance, followed by trunk extensors. While right lateral trunk muscles have higher endurance than the left trunk flexors for male adult swimmers, adolescents as well as female swimmers. Adult male Swimmers had highest trunk endurance among the three groups while male adolescent swimmers trunk endurance was lowest. Preliminary data for core endurance was found and established for adolescent and adult players.

Conclusions: The results may have practical implications for swimming training in relation with core muscle endurance, its effect on performance and prevention of injuries.

Key words: – Age groups, Swimmers, Trunk stability & Core Endurance.