Introduction: Global burden of disease in India top most conditions are non-communicable diseases this is mainly caused due to physical Inactivity. One in every ten deaths globally is reported by physical inactivity related risks. Also, it is evidenced that 6-10% of global death due to non- communicable diseases was in direct relation to physical inactivity. The prevalence of physical inactivity is at its peak, at around 85% worldwide 18% of the total population, due to physical inactivity they are more at risk of NCDs. This study aims to find the level, stages of behavior changes, associated barriers related to physical activity among adolescents.

Methodology: A quantitative research approach with a cross-sectional research design was used. The samples included were 920 adolescents in the age group of 18-19 years who are enrolled in the selected college. Standardized self -administered questionnaires such as the Global Physical Activity Questionnaire and Trans Theoretical model Questionnaire were used to assess the level of physical activity and stages of behavior change related to physical activity. Besides, barriers to participating in physical activity were also elicited.

Results: This study found that about one-fifth of the subjects (20.4%) are physically inactive. We found that they are in pre-contemplation and contemplation stages of behavior change related to physical activity. Compared to females, males are a high chance to do physical activity. The major barriers to physical activity founded as Personal barriers like lack of time and have many tasks. There is a significant increase in physical activity among males than females and it is statistically significant. Healthy practices in a family also found to have a significant association with increased physical activity.

Conclusion: This study concludes that one-fifth of the adolescents are physically inactive almost 90% of males were in the action & maintenance stage compared to 60% in females. The one-third female was reported pre-contemplation & contemplation stage. Two third of adolescents reported having personal barriers they are including lack of time and have many tasks. Many barriers were also reported that prevent adolescents from taking up sufficient physical activity.