Dumbbell kickback

Stand with your feet shoulder-width apart and hold a dumbbell in each hand. Bend your knees slightly and hinge forward at the hips, keeping your back straight. Bring your upper arms close to your sides, with your elbows bent at a 90-degree angle. Extend your arms straight back, squeezing your triceps at the top of the movement. Pause for a moment, then slowly lower the dumbbells back to the starting position. Repeat for the desired number of repetitions.