Sit on the floor with the legs straight forward and together and the trunk as upright as possible, holding a barbell in your jerk or press grip on the shoulders.
 
Press and lock out the full overhead position forcefully, then return the bar to the starting position under control.
 
Purpose
The Z-press position puts more demand on postural strength and control, and can help with shoulder and hips mobility.
 
Programming
Generally sets of 5-15 are appropriate.