The ideal firmness to your mattress allows the apex of your thoracic spine and pelvis to sink in, but then firm enough to support your lumbar spine.
Deep Pressure Massage to the Low Back – Choosing the Right Table
Even more important than table width is table height. As a rule, when generating deep pressure, you want the table to be as low as possible so that you can more easily position your body above the client to take advantage of gravity and body weight.
