Hold a dumbbell in your right hand. Sit on the edge of a bench or chair with your feet slightly wider than shoulder width apart.
Bend forward at the hips and rest your right elbow on your right inner thigh just behind your knee. Allow your arm to hang straight down, elbow slightly bent, palm facing your left leg. Position your left hand or elbow on your left thigh.
Slowly bend your arm to raise the dumbbell toward your shoulder.
Slowly straighten your arm to lower the dumbbell back to the starting position.
Repeat desired amount of reps for that arm then switch to other arm.