_____________________________________________________________________________________________________ *Corresponding author: E-mail: purvi.cop@sumandeepvidyapeethdu.edu.in, purvi840@gmail.com; Journal of Pharmaceutical Research International 33(40A): 282-287, 2021; Article no.JPRI.71770 ISSN: 2456-9119 (Past name: British Journal of Pharmaceutical Research, Past ISSN: 2231-2919, NLM ID: 101631759) Correlation of Hamstring Flexibility with Sitting Hours and Physical Activity among Physiotherapy Students Maitri Shukla 1 and Purvi Patel 1* 1 College of Physiotherapy, Sumandeep Vidyapeeth an Institution Deemed to be University, Piparia, Waghodia, Vadodara, Gujarat, 391760, India. Authors’ contributions This work was carried out in collaboration between both authors. Both authors read and approved the final manuscript. Article Information DOI: 10.9734/JPRI/2021/v33i40A32245 Editor(s): (1) Dr. Aurora Martínez Romero, Juarez University, Mexico. Reviewers: (1) Habil. Márta Hock, University of Pécs, Hungary. (2) Abinet Dagnaw Mekuria, Debre Berhan University, Ethiopia. Complete Peer review History: https://www.sdiarticle4.com/review-history/71770 Received 25 May 2021 Accepted 01 August 2021 Published 07 August 2021 ABSTRACT Background: The hamstring group is an example of muscles which is commonly found to be shortened. Hamstring tightness is caused by extended or prolonged sitting at work places and educational institutions, inadequate physical activity, genetic predisposition, previous injury to hamstring. Objectives: To assess the hamstring flexibility in college students along with their sitting hours and physical activity. Material & Methods: 150 students of college of physiotherapy were included via convenient sampling in the study. Popliteal angle was measured using active knee extension test (AKE). All students’ sitting hours and physical activity were noted. Results: In this study, mean values of popliteal Angle was higher than 20 degree. There was a significant difference correlation between popliteal angle and sitting hours as well as physical activity (p value <0.05). Conclusion: This study showed tightness of hamstring in college students. There is a significant increase in tightness with more sitting and less physical activity. Original Research Article