Holding a dumbbell in each hand, stand with your feet hip-width apart and knees slightly bent. Keeping your back flat and core engaged, bend forward at the hip joints.
Extend your arms so they're straight. Draw your elbows back to lift the dumbbells straight up to chest level, squeezing your shoulder blades together as you do. Don't arch your back.
Lower the weights, with control, back to the starting position. That's one rep.