usually under great pressure as a Keto Burn XXX results of gravity and inversion therapy reverses things allowing the medulla spinalis to relax. many of us cannot do headstands or handstands which is why the gravity tables were invented n athlete. usually under great pressure as a results of gravity and inversion therapy reverses things allowing the medulla spinalis to relax. many of us cannot do headstands or handstands which is why the gravity tables were invented n athlete.