The exercise demonstrated is called a Steel Mace Sumo Squat + Rotational Flag Press.
The sumo squat targets the hips and posterior chain more than a traditional squat.
Proper setup involves wide feet with toes pointing out, holding the Maverick Mace in the rack position.
During the squat, knees should track toes, chest should face forward, and glutes should be squeezed before driving up through the heels.
Progressions of the exercise include choking up on the mace for easier execution and incorporating rotational flag presses at shoulder height after the sumo squat.