Background and Objective: Functional reach test is used for assessing the dynamic balance. It is defined as a maximal distance one can reach forward beyond arm?s length while aintaining a fixed (BOS) Base of Support in the standing position. The biomechanical activities of daily living are into mechanical and neuromuscular factors that may predispose the obese to injury. A better appreciation of the implications of increased levels of body adiposity on the movement capabilities of the obese would afford a greater opportunity to provide meaningful support in preventing, treating and managing the condition and its sequelae. Reaching forward in sitting is a challenge to a person?s postural control and is suggested to be an indicator of sitting balance. Functional reach test is easy to assess the dynamic balance. It is portable, inexpensive, reliable, precise and less time consuming for detecting dynamic balance. This study intends to analyze the effect of various BMI on functional reach test during standing and sitting. Study Design: observational study Setting: Outpatient Department, Saveetha college of Physiotherapy, Thandalam - 602105 Outcome Measures: Quantitative parameters: Functional reach test. Method: observational study design was used for this study. Inclusion criteria- Age: 20-30 year, Vision __ampersandsignndash; Normal/ corrected vision, Vestibular __ampersandsignndash; Pathologies are ruled out, Musculoskeletal- Range of motion: the bilateral shoulder- ranges full (or) for to the test to be carried smoothly. Exclusion criteria-Visual defect, History of vestibular problem, Restriction range motion of bilateral shoulder joint. Ninety individual divided in to 3 groups according to their BMI, each group 30 individuals. All the three groups asked to perform a standing and sitting functional reach test after obtaining informed consent. Result:. Group 1 mean maximal standing functional reach was 27.98 cm, ( S.D-2.98, range= 20.6-33.46), mean of sitting functional reach was 29.09 cm, (S.D-2.42, range=24.36-34.23) for normal individual, Group 2 standing reach was 21.24 cm,(S.D-2.25, range=17.13-25.7), sitting reach was 24.17cm,(S.D-2.44,range=19.63-29.03) for overweight individual and group 3 standing reach was 15.42cm (S.D-3.08, range=10.07-22.60), sitting reach was 18.26 cm (S.D- 2.10 ,range=14-21.73)for obese individuals. There is a significant difference in between the groups. Conclusion: The statistical results of this study concludes that overweight and obese individuals shows less forward functional reach when compared to the normal subjects. Post hoc test shows that there is a highly significant difference were noticed in between the groups