Stand upright holding a dumbbell in each hand at your sides with feet about shoulder-width apart. Keep your chest up, core braced, and feet slightly forward in a stable stance. Lower your body by bending your knees and pushing them forward while keeping your torso as upright as possible. Go down into a deep squat until your thighs are at least parallel to the floor. Push through your heels to return to the starting position, extending your knees and hips while keeping control throughout the movement. Repeat for the desired number of reps.
Log your dumbbell hack squat sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.