Dumbbell forward lunge triceps extension

Stand with your feet shoulder-width apart, holding a dumbbell in each hand. Take a step forward with your right foot, lowering your body into a lunge position. Keep your back straight and your chest up. Extend your arms straight overhead, keeping your elbows close to your ears. Lower the dumbbells behind your head by bending your elbows. Pause for a moment, then straighten your arms to return to the starting position. Repeat the movement for the desired number of repetitions, then switch legs and repeat.