There is essentially insufficient evidence for every common non-surgical treatment approach except epidural steroid injections; and these injections only have one randomized trial showing evidence of modest effectiveness. This puts patients and providers in an uncomfortable position of uncertainty about which approach to non-surgical management is best for which patient. This study is designed to provide evidence to help remove some of this clinical uncertainty experienced by providers who must recommend these treatments. It is also designed to measure outcomes that are important to patients, including measures of physical activity and walking capacity; two of the most patient-centered outcomes reported to us by patients with LSS and their care-givers.