Grab a medium/heavy dumbbell; 25 pounds is a good starting point. If this is too easy or too hard, feel free to adjust the weight.
Stand with your feet shoulder width apart and slightly turned out, and hold the weight in between your legs with your arms fully extended.
Bend your knees and plié, then raise up a few inches. Be sure to keep your arms straight and core engaged the entire time. Your back should be flat and your chest should be up and open.