Stand upright with your feet wider than shoulder-width apart, toes slightly turned out, as shown here. Clasp your hands together at chest level. If you're performing a weighted sumo squat, you'll hold weights: a dumbbell in each hand at shoulder level, or a kettlebell at chest level.
Engage your core. As you bend at your knees and hips, push your butt back; imagine you're sitting in a chair. Aim to keep your chest lifted, your spine neutral, and your 10 toes grounded into the floor.
Go as low as you can while maintaining good form. Work toward your thighs coming parallel to the floor, or sinking even lower — but don't force it.
To come up, squeeze your glutes and push into your feet to return to standing. That's one rep.