Posterior Deltoid Head
To the rear of the shoulder is the posterior 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.
Unlike the front and side deltoid heads, the rear deltoid head does not receive much stimulation from over head pressing exercises, and is usually the most neglected head of the deltoids.
Many back exercises do target the rear deltoid head to a decent level, however. Rowing exercises recruit the rear deltoid head to bring the upper arm backwards, just as the front deltoid head is worked during the bench press.
The rear deltoid head can be isolated like the other deltoid heads, and this is done via bent over lateral raises.
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.
If training for strength, the rear deltoid head will be successfully targeted during the back compound exercises, such as rowing variations and pulls downs.
Posterior Deltoid courtesy of Fitness Uncovered - Bodybuilding & Fitness
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