@marip It does help spine issues in general to increase the core strength of the muscles that support the spine and allow good posture. When you have good posture and the spine is stacked ergonomically, there is much less stress on it. Physical therapy can address that and it can make a difference if the stenosis is not very advanced. Physical therapy does not change what is causing the stenosis which can be overgrowth of bone or enlarged ligaments or ruptured discs. If vertebrae have shifted and are offset by slipping past each other, it will increase the pressure from stenosis by essentially making the spinal canal or foramen smaller. In the foramen which are the spaces between vertebrae, stenosis there gets increased pressure from slipping of vertebrae, ruptured discs, bone growth or by discs that are collapsing, because it starts narrowing down that space where nerves roots exit when the bones get closer together physically because the disc isn't support them.

Sometimes, they need to see if physical therapy helps or not before making a decision to go forward with surgery, and that decision is made based on where the stenosis is affecting the nerves and spinal cord.

You may be interested in checking out this discussion in the Spine Health group where members are discussing stenosis.

Spine Health - "Stenosis/Pain"
https://connect.mayoclinic.org/discussion/stenosis-pain/
Jennifer