Stand with your feet wide, toes pointing slightly out, holding a dumbbell in each hand above your shoulders.
Bend your knees, lowering into a squat until your thighs are parallel with the floor (or as low as is comfortable for you). Keep your knees tracking over your feet and ankles; try not to let them cave in or push out.
Press into both feet to straighten your legs and squeeze your glutes at the top. That's one rep.