Start by lying on your back on a yoga mat holding a dumbbell horizontally in both hands. Bend your knees and place your feet flat on the mat, ensuring that they are hip-width apart and that your spine is in a neutral position.
Extend your arms and hold the dumbbells directly in front of your chest in a neutral grip (palms facing inwards). Draw your shoulder blades down and back.
Inhale, and while keeping your upper arms as still as possible, bend your elbows to lower the dumbbell in front of your face.
Exhale, and using your triceps, extend your elbows to return to the starting position, ensuring that your shoulders, elbows, and wrists remain in line with one another throughout the move. Repeat for 30 seconds.