While keeping your upper arms stationary, curl the weights while contracting your biceps as you breathe out, only the forearms should move.
Continue the movement until your biceps are fully contracted and the dumbbells are at shoulder level, hold the contracted position for a brief pause as you squeeze your biceps.
Slowly begin to bring the dumbbells back to starting position as your breathe in.
Repeat the process for the recommended amount of repetitions.