122 Indian Journal of Forensic Medicine & Toxicology, July-September 2020, Vol. 14, No. 3 Effect of Jack Knife Stretching Versus Proprioceptive Neuromuscular Facilitation (Hold Relax) Stretching Technique in Asymptomatic Individuals with Hamstring Tightness: A Randomized Clinical Trial Amruta Kabra 1 , Kajal Salekar 2 , Tanvi Kalanekar 3 , Kajal Salekar 2 1 Second year MPTh student, Faculty of Physiotherapy, KIMSDU, Karad, Maharashtra, 2 Second year MPTh Student, Faculty of Physiotherapy, DPU, Pune, Maharashtra, 3 Second year MPTh student, Faculty of physiotherapy, GNDU, Amritsar,Punjab 143001 Abstract Background: Study is to compare the effectiveness of Jack knife stretching and Proprioceptive Neuromuscular Facilitation (PNF) stretching Technique in asymptomatic individuals with hamstring tightness. Aims and Objectives : 1. To study the effect of jack-knife stretching on the individuals with asymptomatic hamstring tightness in terms of Active knee extension test, fnger to foor, passive SLR and LEFS Questionnaire.2.To Study the effect of PNF stretching on individuals with asymptomatic hamstring tightness. 3.To compare the effect of Jack knife and PNF stretching in individuals with hamstring tightness. Material and Method: Ethical approval was obtained. 56 healthy subjects were assigned into two groups. PNF (hold relax) stretching technique was given to the Group A and Group B received Jack Knife stretching. Active knee extension test, Finger to foor test, Passive single leg raise test and Lower extremity functional scale these parameters were measured . Results: Intra-group comparison for all the outcome measures in both the groups showed statistical signifcance. Inter-group comparison for all the outcome measures for both the groups had differences but showed statistical signifcance. Group B Jack knife stretching was more effective than group A PNF (hold relax) stretching. Conclusion: The present study results indicate that to increase hamstring fexibility both the treatment techniques i.e PNF stretching and jack knife stretching are effective in asymptomatic individuals with hamstring tightness. Thus, our study shows jack knife stretching gives immediate effect due to closed pack position of stretching compared to open pack position of PNF group Keywords: Hamstring Tightness; PNF Stretching, Jack Knife Stretching Type of Manuscript: Original Article Introduction Almost everyone, regardless of age knows and values the ability to function as independently as possible during activities of daily life. 1 Humans have the capability to produce infnite variety of postures and movements that will need the structures of human body to both generate and respond to forces that produces and control movement at the body’s joints. 2 The movement occurring in the human body is caused by the musculature system. 3 There are about 700muscles,which are attached to the bones of the skeletal system that make up up-to half of the person’s body weight. Hamstring muscles is situated at the posterior part of the thigh. It includes 3 muscles – biceps femoris muscle, semitendinosus Correspondence: Miss. Kajal Salekar Second year MPTh student, Faculty of physiotherapy, DPU, Pune, Maharashtra 411018 Contact no.9108101664 Email id: kajalsalekar21@gmail.co