Holding a dumbbell in each hand, sit down and rest your elbows and forearms on your thighs, palms facing down. Elbows should be bent about 90-degrees and the dumbbells/hands should hang freely. Wrists are in line with the forearms.
Exhale and slowly roll your wrists to pull the weight up. Hold this position briefly.
Inhale and slowly bend at the wrist so that the dumbbells move toward the floor. Do not release your grip, straighten your elbows, or lean forward/backward. Repeat.