People don't use the best technique with overhead presses. This drastically inhibits the potential to pack on muscle and negates the long-term health benefits to the shoulder girdle. Due to the seated position of the Z press, cheating is tough to do.
The Z press is done seated on the floor with your legs stretched out in front. Because there's nothing to lean into, there's greater trunk and upper back strength needed to stabilize the body. As soon as the exercise begins, you'll notice the body self-regulating into efficient postural alignment to maintain balance.
A final thought on the Z press: it's a natural "plateau buster" for the bench press. Because the body is inhibitory by nature, bench press plateaus can often be attributed to weakness through the shoulders, upper back, and triceps. – Alan Bishop
