Biomechanics and the Bench Press

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					Biomechanics and the Bench Press
Mike Roberston

How many times since you've been going to the gym have you heard, "Dude, how
much can you BENCH?" If you've been training for a while, I would venture to
guess quite a few. Big bench pressers are always highly revered, especially because
someone with a massive bench can inspire everyone, not just powerlifters. To top it
all off, the bench press is the only true test of upper body strength in a powerlifting
meet. Finally, and let's be honest here, who doesn't want a big bench?

The Warm-up
The basic warm-up for the bench press is just like the other exercises. A general,
total body warm-up prepares the muscles and nervous system for the workout at
hand. Any kind of total body exercise will do; just perform about 5-10 minutes, or
enough to break a light sweat.

As for the specific warm-up, it helps to warm-up the entire upper body to get the
blood flowing. For instance, try a brief circuit with light dumbbells to get warmed
up. Try 2 sets of 10 before your next workout, following the circuit below:

      Bench press
      Flies
      Shoulder press
      Bent over rows
      Upright rows
      Curls

The point of this warm-up isn't to pre-fatigue the muscle, but rather to get all the
muscles, tendons and ligaments warmed up. Thoroughly warming up these areas
can help prevent strains and tears, as well as help prepare you mentally for the
lifting to come.

Biomechanics of the Bench
In my previous articles, we discussed the basic biomechanical principles behind
lifting. Here is a quick refresher for those who didn't read the first articles:

Work = Force x Distance

Work in the powerlifting sense should be minimized to maximize the weights
moved. Distance is self-explanatory; the distance the weight has to be moved. Force
needs a little further explanation:
Force = Mass x Acceleration

Mass is essentially the weight on the bar, and acceleration is how fast you are
moving the bar (remember, this is a generalization, used to prove a point). In
essence, if you are moving 300 pounds, the mass is the same (300 pounds) and the
acceleration will essentially be the same from rep-to-rep. However, acceleration in
the bench press can and should be worked on, but this will be discussed to a greater
extent later on.

Again, the point of all this is to show that to maximize our performance, our
mechanical WORK should be minimized. To improve the bench, a two-pronged
approach will help us see gains in the shortest period of time. First, we will examine
how we can decrease the DISTANCE moved, and second, we will discuss ways to
improve our acceleration (or our FORCE).

Ways to Decrease the Distance Moved

I am far from being an elite bencher, but I am constantly working on it. The first
thing I knew I needed to work on (especially since I have a deadlifters body), was to
minimize the stroke needed to get from point A to B. I started by slowly moving my
grip out to the maximum legal limit. This immediately took about 3 inches off my
stroke. The next move was to improve my arch. To say that I had no arch was a
compliment. I was almost totally flat on the bench! My first move was to start
digging my shoulder blades into the bench, and then to pull my legs as far
underneath my body as possible. Total back flexibility is at a premium here,
especially if you want to improve your bench. One way to work on this is to buy
different sizes of PVC pipe and start working on your arch before, during or after
your workouts. My current coach (Dr. Mike Hartle, a 518 bencher at 275) stated
that at the IPF Bench Press World's the Japanese participants were warming up
with 6 inch PVC pipes under their back! Start with a small size, then slowly
progress up to larger and larger pipes, all the while shaving important inches off
that bench press stroke!

Ways to Increase Force (especially Acceleration)

Acceleration training in the powerlifting world has really come around in the last
decade or so. However, there are several ways to increase acceleration in the bench
press. First, you can do plyometric exercises to train the nervous system and related
musculature in a semi-specific manner. Options include plyo push-ups, med ball
throws from a lying position or bench throws in a Smith or Plyopower machine. The
next option is to use methods of accommodating resistance, such as bands and
chains. A final way is to simply use lighter weights: when you examine the force
equation listed above, you see that force is equal to mass times acceleration. In order
to keep the force output the same, if we decrease the mass on the bar (e.g. take it
from 200 pounds to 150 pounds), we have to increase our acceleration accordingly.
By decreasing the weight on the bar and moving it as fast as possible, we are
keeping force output the same or possibly even increasing it, all by improving
acceleration.

Muscles used in the Bench Press

The bench press, like all the powerlifts, is an effort to move maximal amounts of
weight in order to improve your total. I will explain both the prime movers in the
bench press and the muscles that help stabilize the body and "get tight." Lastly, I
will put in a note regarding muscular balance in the bench press.

Prime Movers

      Movement: Extension of the Arm
      Muscles: Triceps Brachii

The triceps are the main muscle group that locks out the bench press. Extension of
the arm, therefore, is key to having a big bench. It's important to hit the tri's using
different exercises, especially a mixture of extension-based and press-based
movements. Extension based movements include skullcrushers, throatcrushers,
elbows out extensions, etc. Press-based movements include dips, narrow grip
benches, narrow grip declines, etc.

      Movement: Shoulder flexion
      Muscles: Anterior deltoid and pectoralis major (clavicular portion)

Both the anterior deltoid and the pectoralis muscles function in a similar fashion.
From the moment you take the bar out of the rack, you are in a state of shoulder
flexion (when you hand moves from the waistline towards the face, this is shoulder
flexion). Therefore, these muscles are used heavily throughout the course of the
movement. Exercises to work the anterior deltoids and clavicular portion of the pecs
include plate raises, forward dumbbell raises, and of course flat and incline benches
of all varieties. In essence as you increase the angle from a flat to incline bench, the
more involvement you will get from these muscle groups.

      Movement: Medial (internal) rotation of the humerus
      Muscles: Pectoralis major (sternal portion) and anterior deltoid

The pectorals are the prime mover in the lower portion of the bench. As you
increase the incline of the bench, however, the sternal portion of the pecs are taken
out of the movement and the clavicular portion of the pecs and anterior deltoids
take over. Therefore, low level inclines, flat bench, wide grip bench, and especially
declines of all varieties are great options for hitting the pecs. Declines are an often
forgotten exercise, but they are great for focusing on sternal pec and tricep
development while simultaneously reducing the role of the anterior deltoids and
clavicular pecs.
Stabilizers

Low-Body Stabilizers

Getting the low body tight in the bench is essential if you want to press limit weights.
While there aren't specific exercises you can perform to increase your low body
stability, work to bring your feet back closer to your head, which will increase quad
activation, as well as squeezing the glutes and hamstrings to maximally activate the
posterior chain.

In my first year of powerlifting, I never understood the importance of getting the
low body tight, and my bench press lagged behind my other lifts because of it. While
preparing for Collegiate Nationals in 2002, I was stuck with a measly 275 pounds on
the three-board press. My training partner at the time, Joe Williams, told me to get
my low body tight and squeeze my glutes as hard as possible. Not only did I hit 275
for a triple, I went on to hit a fairly easy 300 that very same day, and all I did was
get my low body tight!

Upper-Body Stabilizers

The key upper body stabilizers are the muscles of the mid-back. More specifically,
we are talking about the middle trapezius fibers, rhomboids, and latissimus dorsi.
The key here is to pull the scapula back to form a solid pressing surface. Newton's
3rd Law states that for every action (or force), there is an equal and opposite
reaction. In essence, the more force you produce down into the bench, the more
force will be produced to move the weight back up. This is also why some great
bench pressers state to think of pushing away from the bar versus pushing the bar
up.

Unlike the low-body stabilizers which are more set-up oriented, you can build the
upper body stabilizers. Exercises such as bent-over rows, T-bar rows, face pulls,
prone shrugs, etc., can all increase the hypertrophy of the mid-back muscles, and
therefore stability in the bench press. Another bonus of hitting the mid-back is that
increases in size will also shave some inches off your bench press stroke!

Balancing out your bench

When talking about bench pressing, we also need to discuss injury prevention and
its role in the training program. When bench pressing, the shoulder is performing a
significant amount of internal rotation to move the weight. However, it's rare that
you see someone in your gym performing external rotation work to keep the
shoulder joint healthy and keep the PR's climbing.

One my clients here at the Athletic Performance Center had the worst case of
rotator cuff tendonitis I had ever seen. He was a very strong bench presser, but
eventually, the shoulder rotation was too great and he was forced to switch to
dumbbells. After a few months of training even the basic dumbbell press became too
stressful and he switched to dumbbells using a hammer grip (which further reduces
the amount of rotation about the shoulder joint.) Inclines throughout this period
were out of the question. It got to the point where he couldn't even put his arm
around his wife at the movies! Orthopedic surgeons stated that he should get
surgery to repair the injury, but instead, he came to us for help. The Drs. Hartle
performed Active Release Technique ™ (ART™) to break up the scar tissue and
muscle adhesions that had formed in and around his shoulder joint. Next, an
aggressive rehabilitation program was put together that emphasized strengthening
the muscles of the rotator cuff (supraspinatus, infraspinatus, teres minor, and
subscapularis), scapular depressors (lower trapezius fibers), scapular retractors
(rhomboids and middle trapezius fibers), and posterior deltoids. Stretching of the
pectoral muscles and anterior deltoids was also included. Within 6 weeks of therapy,
he was back to hitting the flat bench press with no pain, something that he hadn't
been able to do in 12 years! The moral of the story is that if you cover your bases
from the start and take care of your body, you will enjoy a much stronger and
healthier powerlifting career than if you do just enough to get by.

Pressing max weights

Let's put all this theory and anatomy into some practical application. The first thing
that needs some description is the set-up. Start by pulling your shoulders blades
back and together as tight as possible, then really try to "dig" your way into the
bench. The higher you can set the middle back and traps on the bench, the better.
Next, we need to work on the low body. A shoe with a heel is an excellent choice for
benching because it allows you to get your feet back farther back (e.g., closer to your
head) than you normally could. By pulling the feet back farther, you get greater
quadriceps stabilization and an improved arch. The last thing you need to do is to
actively contract the hamstrings and squeeze the gluteals as hard as possible. This
should really tighten up the entire low body and get you ready for a big bench. At
this point you should be ready to receive the weight from the spotter.

Before taking the bar, a big breath should be taken while simultaneously "puffing"
out the abdominals and chest. This will help finalize the tightness of the body, as
well as reducing the distance traveled a little more. A hand off is critical on all work
sets as it allows you to maintain your arch and tightness. Without a hand off, you
will see someone lose their upper back/lat stability, therefore making the bench that
much harder. The hand-off should take the bar to an area above the lower pectoral
or high abdominal area (see note below!). At this point the bar is lowered, with the
elbows tucked, down in a straight line or at a slight angle to the lower chest/upper
abdominal area. The bar must be completely motionless, and then pressed following
the same path as it was lowered.

Especially when wearing a bench shirt, you must be conscientious of what your
body is doing. Gear reduces the body's natural kinesthetic awareness, so you can't
"feel" the movement as well. Therefore, you must learn to stay tight within the
shirt. If you go loose in the shirt on the eccentric phase, you increase your reliance
on the shirt, which sets you up for failure. You will most likely miss the weight
because you aren't ready when the shirt strength runs out, or you will slip the
groove and push the bar horizontally towards your waist or back towards your face.
By staying tight throughout the movement, you not only keep a better line, but you
utilize both your strength and the boost from the shirt to blast the weight up to the
top.

A final note on benching: Know the rules of your federation. Some federations state
the xiphoid process as the lowest point the bar can travel to, while others don't
specify or are more lenient in their interpretation. At the USAPL Collegiate
Nationals this year, I saw several lifters miss otherwise good attempts because they
were lowering the bar to their abdomen instead of the xiphoid process. Again, know
your federations rules (and your gear) to ensure your success come meet day!

Where is your sticking point?

Let's face it, unlike low body exercises like squats and deads which you can
sometimes "muscle" up, the bench press is a different beast because it's rare that
you see someone grind through a sticking point to get the lift. Therefore, the goal of
this last section is to obliterate those sticking points and hit some new PR's!

If you miss at the bottom or can't get the bar off your chest:

If you have a weakness here, you need to work on pectoral strength and increasing
acceleration. First off, check to see if you are lowering the bar too slowly. More
often than not people who miss near the chest are doing about a 4 or 5 second
eccentric, virtually negating the stretch-shortening cycle. If the eccentric speed is ok,
then increasing pec strength and/or acceleration can help to alleviate this problem.
Heavy dumbbell presses, cambered bar presses, speed bench work with bands,
plyometrics, etc., can all help to improve your strength and speed off the chest. The
final option is that your ego is stronger than your body, so think about lowering the
poundage and using weights that better match your strength!

Especially in powerlifting competitions where bench shirts are allowed, it is a rarity
that someone misses a weight off their chest.

If you miss at the mid-point or top of the lift:

This is probably the most common sticking point for the bench press, especially
when it comes to powerlifters. Again, the bench shirt is there to help you blast the
weight off your chest, but it's up to you to lock that weight out.

The midpoint of the lift is tricky because this is the point where the shirt is giving
out and you are taking over. If you hit this point and come to a grinding halt, then
either the weight is too heavy or you need to work on speed to drive through the
sticking point. Again, speed work with bands or chains can help train the body to
drive through the sticking point and lock out the big weights.

Another possibility is that you slipped the groove of the bench shirt and the bar
either moved towards your feet or back towards your face. This usually causes the
bar to drop slightly somewhere along the way, and even if you do lock it out (which
is tough), the red lights will probably fly. The best advice here is to make sure you
get the shirt on at least 2-3 times before your meet to break it in and learn the
proper groove of that particular shirt.

If you miss above the mid-point or at the top of the lift, the triceps are the key.
Increase your triceps strength and your bench press will go up. If you are training
bench twice a week, I would make sure one day includes extension-based
movements and the other is geared towards press-based movements. Extension-
based movements such as skullcrushers, elbows out extensions, etc., tend to
"isolate" (for lack of a better term) the elbow extensors and overload the triceps in a
direct manner. On the other hand, the press-based exercises such as dips and
narrow-grip benches use the anterior deltoids, pectorals, and triceps in concert, and
therefore more weight can be moved. More weight equals more muscle and
strength, and hopefully a bigger bench press.

The last option is that you aren't used to having heavy weight in your hands. If your
speed is good, then I would suggest using your accessory bench day to perform some
heavy lockout work. Not only does this improve your lockout strength, but it also
increases your confidence with heavy weights. Options include exercises such as
reverse band floor presses, basic floor presses, board presses, board presses with
bands, etc.

Conclusion
While the bench press is probably the least functional of all the powerlifts,
improving your strength and technique will increase your total all the same.
Hopefully this article has shed some light on what muscles are working while
benching, how to train them, and ways to improve your bench press from start to
finish.

This also completes my series on the biomechanics of the powerlifts. It should be
stated that well-planned training, proper nutrition and recovery, and a great deal of
dedication and courage are a must to be successful at this sport. Beyond this, I hope
you will use the biomechanical principles I have explained in these articles to take
your lifting and performance to the next level!

About the Author:
Mike Robertson, M.S., C.S.C.S., U.S.A.W., is the Director of the Athletic
Performance Center (APC) in Fort Wayne, Indiana. The APC offers sport
performance training, injury rehabilitation, and personal training services to its
clients. Mike received his Masters in Sports Biomechanics from the Human
Performance Lab at Ball State University, has been a competitive powerlifter, and is
the USA Powerlifting State Chair in Indiana. To contact Mike, please send an e-mail
to mikerob022@yahoo.com

				
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posted:9/16/2012
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