Lateral Raises are one of the only exercises that isolates the middle of the shoulder, and should be central to any good mass-building shoulder workout. If anything, it's the sides of the shoulders that are the most important in building a wide V-shape physique. Slowly raise the dumbells out to the side, until they are level with your head - don't go higher than this as it can put undue stress on your rotator cuffs.
If you're doing a workout split routine, it makes sense to do lateral raises on the day you train shoulders.
Stand with your back straight, feet shoulder width apart, while holding a dumbbell in each hand with a neutral grip.
Keeping your arms fully extended and your torso stationary, lift the dumbbells out to your sides and up until they are at shoulder level.
This will be your starting position.While keeping your body stationary, exhale and lift the dumbbells outward to the side and up until your arm is just past parallel to the floor. If that's your goal, then you should view side laterals as at least equally important (if not more) than your overhead presses.
So many people use momentum to swing heavy weights up, and this is not going to get you the best results from the dumbbell lateral raise. If your wrists come up to far, the focus comes off your side delts and onto your front delts. A good trick to ensure this does not happen is to tilt the dumbbells down as if you were pouring a jug of water as you raise them up.
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