The Overhead Press
The overhead press is the best size and strength builder for the shoulders that's out there, when it comes to shoulder training too many guys are working on excessive amounts of isolation via exercises such as the front raise, dumbbell lateral raise and rear deltoid fly... these exercises are useful for isolating the different heads of the shoulder however to build overall mass and powerful shoulder strength you need to be pressing heavy!
Proceed With Caution
When performed incorrectly the overhead press can be disastrous - as your lower back and shoulders are taking the load during the overhead press poor form and lifting with your ego can result in injuries that could stick with you forever. Ensure you're not making the 5 mistakes below in order to keep your shoulder mass and strength progressing while your lower back and rotator cuffs remain safe.
Are You Making These 5 Overhead Press Mistakes?
Not Pushing the Bar Vertically
The barbell should take the shortest path to the top - this is directly in-line with your body.
You should solely be pressing upward, not forwards or backwards.
Not only does pressing forward place more emphasis on the chest and front deltoids (as opposed to working the entire shoulder) you'll struggle to lift the weight once you're going heavy as this is more of an isolater and your balance can also be compromised as you push the barbell infront of you, making it a struggle to maintain your ground without falling forward.
Overarching Your Lower Back
Leaning excessively far backwards and 'planting' yourself into position when lifting heavy can see you falling backwards if your core stability begins to falter. A large tilt backwards in your upper body also mimics an incline bench press to an extent and will see you lifting heavier on your overhead press as you're recruiting more upper chest to assist with the movement - we're isolating the shoulders here and stronger muscle groups intervening with our shoulder press is not what we want. Keep your body upright with a very minuscule lean, not one that resembles an incline bench press angle.
Bouncing Your Knees
Throughout the movement your knees should be slightly bent (I do not recommend locking out your knees as this compromises your stability) however your knees should not be moving at all. Bouncing at the bottom of each repetition can quickly turn an overhead press into a push press or god forbid a thruster. These exercises utilize momentum in order to muscle the weight out of the 'hole' - the bottom part of the movement which requires the most strength to get the barbell moving.
Consciously ensure your not bouncing the weight up on each rep, if you're unable to raise the barbell overhead without bouncing it's time to drop the weight down a bit and perfect that form - lifting with your ego and utilizing poor form to get the weight up will never do you any good in the long run.
Too Much Weight
You should be lifting a weight on your overhead press that you actually can lift with correct form for your prescribed number of repetitions.
If you're struggling to get the weight up you're setting yourself up for disaster.
Leaning forwards, falling backwards, utilizing momentum to drive the barbell upwards while pushing it away from your body... when excessive amounts of weight is used for pressing movements you'll naturally do whatever you can to get it overhead.
Form ALWAYS comes first, muscling weight that's too heavy for you to manage before dropping it on your head isn't going to help you build the shoulder strength and size you want.
Not doing Full Range of Motion
Don't expect to reap all the results of the overhead press if you're only working half of the range of the exercise.
This is without a doubt the most common mistake I see being made with most exercises, and the overhead press is no exception! Your arms should be locked out at the top of each repetition with the barbell directly above your head. When lowering the barbell it should come all the way down to the top of your chest - don't stop once the barbell is in line with your nose and your arms are parallel, you aren't working the shoulders in their entirety.