Spot Pal Fit is a custom fit tongue training appliance designed to teach proper tongue position by encouraging the tongue to rest in the roof of the mouth. Its custom, unobtrusive design, makes it comfortable to wear and does not interfere with the ability to communicate. Studies have shown that proper tongue placement can greatly increase endurance, flexibility, strength and power. Spot pal fit can also be worn when playing sports that do not require a mouthguard to protect the teeth.
Read the studies: (can we list some studies on this page that shows increase in performance with proper tongue up posture?)