Background: Obesity is associated with various physiological changes which decrease the cardiovascular fitness& flexibility& slows person activity. Core muscles strengthening improve respiratory efficiency and activity of the diaphragm. Hence this study aimed to examine effect of core strengthening on cardiovascular fitness & flexibility in obese individuals.

Method: Experimental study of 6 weeks was carried out among 16 people which were selected by purposive sampling there was 1 drop out. Subjects between 18-25 years, male & female with BMI ≥ 25 kg/m 2 -35 kg/m 2 were selected. Pre reading were taken by measuring Queen' s college step test, Modified sit and reach test, Shoulder and arm flexibility test which were recorded at week 1st, week 3rd & of the same at 6th week .Core strengthening exercise were given targeting 5 regions Upper & middle Abs ,Oblique, Transverses ,Lower abs were progressed every 2 weeks by increasing repetition and difficulty level eg. Unstable surface (swiss ball).

Results: A significant improvement was found in readings of VO 2max (Queen's College step test),   modified sit & reach test, shoulder & wrist flexibility test (p<0.0001).

Conclusion: The study showed positive result with (p<0.05) which suggests that core strengthening improves cardiovascular fitness and flexibility in obese individuals.

Keywords: Core strengthening, Exercise, Flexibility, Cardiovascular fitness, Obesity