Weighted Cossack squats are a unilateral exercise that targets the glutes, hamstrings, and quads. To do this exercise, youll need a weight, such as a dumbbell or kettlebell, and a stable surface to stand on. Start by standing with your feet shoulder-width apart and the weight in your right hand. Step forward with your left foot and lower your body until your left knee is at a 90-degree angle and your right knee is nearly touching the ground. Keep your back straight and your core engaged throughout the movement. Pause for a moment at the bottom, then push through your left heel to return to the starting position. Repeat for the desired number of reps on each side.