I gave my answer here
permies page
As a historical user and massage therapist I know that with understanding the muscles and reflexes involved scythe mowing is an excellent opportunity to improve your spinal function. I use it regularly for myself.
One rule of caution: Have you been taught the RULE OF FUN? If an activity is not FUN it is not FUNctional. Continuing the activity strengthens the disfunction. Frequency is better than repetition in changing the firing pattern of the walking reflex and you are using the walking reflex when mowing only exaggerating the arm motion and minimizing the leg motion.
I expect that checking and adjusting the grip placement each time you pick up the scythe will contribute to your improvement.
You are welcome to PM me with specific questions or for contact with your therapists that are not familiar with the motion of cutting with the scythe.