Breathe in and lift the dumbbells to the shoulders keeping the thumbs towards you. Concentric contraction: Breathe out. Press the dumbbells in a controlled manner but don't fully lock the elbows.
Eccentric contraction: Breathe in. Lower the dumbbells slowly in a controlled manner (2-4 seconds). Repeat until the desired number of repetitions is completed. Keep the back straight and bend the knees when placing the dumbbells on the floor.