This is an isolation exercise so its important that you focus on strict technique to isolate the front deltoids.
Dont let the barbell touch your body during the set, and dont raise the barbell above shoulder height.
Keep the rep timing slow, and lower the weight slowly.
And finally, keep your mid section tight and your back straight. Dont swing to assist moving the weight up.
Instructions
Set up for the barbell front raise by loading a straight bar or EZ bar with the weight you want to use. Grasp the bar with an overhand grip (palms facing down) with your hands around shoulder width apart.
Sit down on the end of a flat bench and let the barbell rest on your thighs.
Straighten your back, tense your mid section and pull your shoulders back, taking the weight off your thighs and holding it about 4 inches above your thighs. This is the starting position for the exercise.
Keeping your arms straight slowly raise the barbell up to shoulder height.
Pause, and then slowly lower the barbell back to the starting position.