You can transform your body by adding in the Plank to your
life
The ability to create tension and torque through your midriff ensures a protected back and, as all complex movements starts with an engagement of these muscles, means you have a strong centre.
Check out the picture below. Unlike the upper back and shoulders, legs, arms and shoulder with all the bones to add support, the lower back area
only has the spine, and all support comes from the many muscles surrounding it (you can just see them in red). Weakness here exposes the spine to poor posture, damaging forces and reduces strength.