While keeping your upper arms stationary, exhale and curl the weights while contracting your biceps. Continue to raise the weights until your biceps are fully contracted and the dumbbells are at shoulder level. Hold the contracted position for a brief moment as you squeeze your biceps.
Inhale and slowly begin to lower the dumbbells back to the starting position.
Repeat the process for the recommended amount of repetitions.
Make sure to keep your elbows close to your torso at all times and do not use your back or shoulders to lift the weights; your biceps should do all the work.