An excellent demonstration of the force that can be generated by using body weight is to lean down onto a bathroom weight scale that is placed on a table that is positioned as various heights. Simply relax and lean into the scale with your body weight and notice the force that you generate.
Neck Deep Pressure Massage: Step by Step – Apply Pressure Perpendicularly
When performing deep pressure massage into the neck, maximal pressure for minimal effort is achieved if the angle of your pressure into the client is perpendicular to the contour of the neck where you are working.