 [ Symptoms ] i have central posterior disc herniation with annular tear [ Disease ] hi physical therapy should be in the form of back stretching exercise + abdominal strengthening aiming to achieve a posterior pelvic tilt to increase posterior disc space if you have done that and no progress then surgical treatment in the form of laminectomy is the best option by the way attempting to strength quadriceps will severely increase your pain biomechanical point of view  good luck