Lateral / Medial Deltoid Head
To the side of the shoulder is the lateral or medial deltoid head, one of three heads of the deltoid muscle structure. The deltoids muscle can thank its name to the Greek letter Delta, which is a triangular shape.
Creating the width of the shoulders, the middle deltoid head is an important muscle head for anybody wishing to create a wider look. As with the front deltoid head, the side deltoid is effectively targeted by over head pressing movements.
Similarly to the anterior deltoid head, some people opt not to include any direct isolation work to their workouts, as many compound pressing movements will successfully recruit the deltoids. Many trainers in fact choose to only use over head pressing to target the deltoid muscles.
When training for muscular size it is often best to train in a rep range of 6-12 repetitions, although there is often much debate on the optimal rep range. It would be advisable to experiment with different ranges to see which suits you. Remember that the shoulder joint is very complex and easy to injurer if performing an exercise incorrectly or without the incorrect warm up. You should warm up the shoulder muscles prior to a shoulder training session.
Lateral Deltoid courtesy of Fitness Uncovered - Bodybuilding & Fitness
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