Stand straight, with your feet shoulder width apart, holding the dumbbells by your sides. Bend your elbows to bring the weights straight up to just above shoulder height. When stable, bring your elbows in line with your hips, bent at 90 degrees or just past.
Start by pressing the dumbbells straight upwards, squeezing through the shoulders until your elbows are almost fully extended. Then slowly lower down until your'e back at approximately a 90 degree bend. Ensure that your elbows stay in line with the front of the hips when going up and down. Keep your forearms aligned with your wrists at all times for the movement and brace your core throughout to keep your back straight. Repeat for the desired amount of repetitions then gently lower the weights straight down and onto on the ground.
Avoid excessively arching your back and make sure that your elbows arent moving too far behind the shoulders.