Stand upright with feet shoulder-width apart and holding two dumbbells in front of your body with an overhand grip.
Keeping your upper arms by your side, exhale and raise the dumbbells up towards your shoulders by flexing your arms. Avoid using your legs or back to lift.
Continue until your arms are fully flexed and the dumbbells cannot be curled any further.
Inhale and lower the dumbbells to return to the starting position.