<qa>  What is the study that will not include patients who received steroid injection to the epid- the study will not include patients who received steroid injection to the epidural space as part of previous treatment, the study will not include morbid obese patients B.M.I over 30, patients with symptomatic coronary artery disease, patients with known osteoarthritis that or any orthopedic disease that limit their walking capacity, C.O.P.D patients. 