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. ABSTRACT 1.1 BACKGROUND: Football (soccer) matches traditionally take place on natural grass, although different playing surfaces are used including sand, dirt, clay, concrete, asphalt, and hardwood. In dray counties maintaining a natural grass surface is expensive; therefore in this area especially in parts of Asian and Africa most football fields are dirt fields (DFs) (bare earth) and many football players, especially amateur ones, play on DFs in these regions. Most common injured part on dirt field was ankle (28.5%) and on artificial turf was knee (24.3%) Results suggest that the incidence of match football injuries on DF are higher (about two times) than this rate on artificial turf. The calf muscle situated at the posterior side of the Lower limb is composed of the soleus muscle, the medial and lateral heads of the gastrocnemius (composing the triceps surae muscle), and the tibialis posterior. ROM of the ankle joint is related to performance in daily activities and sports. Reduction of ROM dorsiflexion is reflected in a lower efficiency of walking and running and is related to several lower limb disorders, including Achilles tendinitis. The decrease in ROM due to increased muscle stiffness can reduce the ability of the musculotendinous-unit to absorb impact and generate optimal force. Continuing sport performance during this stage of reduced impact absorption may increase the risk of injury. Muscle energy technique (MET) is a procedure that involves voluntary contraction of a patient's muscle in a precisely controlled direction, at varying levels of intensity. It is unique in its application as the client provides the initial effort while the practitioner facilitates the process. MET is based on the concepts of 63 Autogenic Inhibition and Reciprocal Inhibition. If a sub-maximal contraction of the muscle is followed by stretching of the same muscle it is known as Autogenic Inhibition MET, and if a submaximal contraction of a muscle is followed by stretching of the opposite muscle, then this is known as Reciprocal Inhibition MET. Autogenic and reciprocal inhibition both occur when certain muscles are inhibited from contracting due to the activation of the Golgi tendon organ (GTO) and the muscle spindles. Various benefits of MET include reduction in tone of muscles and improved joint mobility 1.2 AIM AND OBJECTIVES: The aim of the study was to find out the effect of Muscle energy technique on calf muscle flexibility and strength and endurance in amateur football players playing on dirt field at the end of 10 sessions. The objectives of the study were 1. To find out the effect of MET on calf muscles flexibility in amateur football players playing on dirt field using ankle lunge test at the end of 10 sessions. 2. To find out the effect of MET on calf muscles strength and endurance in amateur football players playing on dirt field using standing heel rise test at the end of 10 sessions. 1.3 METHODOLOGY: Ethical clearance was obtained from the institutional ethical committee. Subjects satisfying the study inclusion criteria were enrolled and briefed about the study. Informed consent was obtained from all the subjects.46 individuals were selected. Pretest measurement was taken, ankle lunge test was performed before heel rise test. Intervention in the form of post isometric relaxation technique to calf muscles was given for 10 consecutive days. Posttest measurement was taken ankle lunge test was done before heel rise test. Data was collected and analyzed. 1.4 RESULTS: There was significant difference (p<0.0001) seen in the pre (12.37+1.311) and post (13.45+1.268) mean of right side and pre (12.4+1.282) and post (13.83+1.525) mean of left side of ankle lunge test Thus muscle energy technique is effective in improving flexibility of calf muscles in amateur football players at the end of 10 days.There was significant difference (p<0.0001) seen in the pre (23.22+5.072) and post (26.41+5.651) mean of right side and pre (22.22+5.696) and post (24.95+4.784) mean of left side of single leg heel rise test. Thus muscle energy technique is effective in improving strength and endurance of calf muscles in amateur football players at the end of 10 days. 1.5 CONCLUSION: Hence, it is concluded that muscle Energy technique is effective in improving calf muscle flexibility, strength and endurance in amateur football players playing on dirt field at the end of 10 days.