Straighten the legs keeping the back straight as you lift the dumbbells. The arms hang straight down at the sides with palms facing inwards. Keep elbow tucked into the side.
Concentric contraction: Breathe out. Flex the arm fully.
Eccentric contraction: Breathe in. Lower the dumbbell with control (2-4 seconds). Keep the elbow in at the side. Alternating arms, repeat parts until the desired number of repetitions are completed.