Inclusion Criteria:  - Patients are males. Their age will range from (25-40) years. Patients will suffer from second-degree burn ( Partial thickness of thermal injury). Total body surface area (TBSA) for the burns will be ranged from 20% to 35% . They will be selected from Outpatient Clinic of Faculty of Physical Therapy and Burn Unit at Om El-Obour Hospital. Patients will begin the training program after complete wound healing. All patients will receive traditional physical therapy program in the form of range of motion exercise, stretching, splinting, massage, functional training for ambulation and activities of daily living. Patients will be given their informed consent.  Exclusion Criteria:  - Patients who participate in any rehabilitation program to improve muscle strength prior to the study. Musculoskeletal disorders that will impair performance during training and tests. Equilibrium disorders. Uncontrolled cardiovascular or pulmonary diseases . Neurological and renal disorders. metabolic or vascular disease with a neurological component such as diabetes, Malignant conditions. Psychiatric illness, severe behavior or cognitive disorders. Subjects with burn to the posterior thigh with knee flexion contracture, which affected the function of the quadriceps muscle. Lower limb lymphedema or lipoedema. Athletic subjects. Subjects with morbid obesity.