To perform alternate dumbbell front raises grip a dumbbell in each hand and hold them in front of your waist with your palms facing your legs. With your elbows slightly bent, raise the dumbbells directly up in front of you with a forceful movement slightly higher than shoulder height. Control the weight back down to the starting position in a slower manner. Alternate arms and do the same with the other arm.
Do not be too stiff and rigid during the movement. Use your body's natural momentum as you move the weight. Being too stiff will cause you to move against your body's natural mechanics.