The present invention provides methods, devices, and systems for restoring or improving nervous system function of a subject. Vertical aiming adjustment is allowed by swinging the firearm forward or backward within the cradle andor adjusting the cradle along the fore-end of the stock of the firearm. The solution may be used for treating any type of water, but has particular application in treating drinking water and irrigation water. The system includes first and second bypass devices. The first and second loops are configured to snugly surround a user’s body parts to allow the user to stretch by creating a tension in the attachment portion.