Exercises You Should Be Doing: Quadruped Rhythmic Stabilizations
Posted on Dec 3rd, 2009 by Tony GentilcoreWhat Is It: Quadruped Rhythmic Stabilizations
Who Did I Steal It From: This is one of those exercises where when I originally saw it, I immediately thought to myself “huh, why didn’t I think of that?”
As it is, Mike Reinold is a helluva lot smarter than I am. And while the word “steal” is a bit of a misnomer given that there were 40+ other people in attendance when I saw it demonstrated a few weekends ago, nonetheless, I still need to give credit where credit is due.
What Does It Do: Before I get into that, lets take a few steps back and get a little geeky for a moment. If I were to ask you what is the function of the rotator cuff, what would you say? If I were a betting man, I’d garner that the vast majority of people reading would say one of three things:
- External/Internal rotation of the arm (glenohumeral joint).
- Elevates the arm in the scapular plane.
- [crickets chirping] ummm, uhhhh, [crickets chirping] Throw me a freakin bone dude. Isn’t this the part of the post where you post a picture of a scantily clad hot chick?

If you mentioned either of the two former options- congratulations you’ve obviously read an anatomy book within the past 25 years. As such, while you’re technically not wrong, you’re not entirely correct either. But more on this in a bit. In regards to the latter option, THIS is actually the point where I post a picture of a scantily clad hot chick:

To that end, while the rotator cuff does invariably play a significant role in external/internal rotation, as well as elevation of the arm, you’d be remiss not to recognize that it’s main function is to simply center the humeral head within the glenoid fossa.

That said, with respects to rotator cuff rehab (as well as preventative maintenance in general), Mike Reinold has noted on several occasions that one of the most important aspects is dynamic stability. This is particularly true when dealing with athletes, which makes a lot of sense given the more dynamic nature of sports.
As a general rule of thumb, athletes (specifically overhead athletes) inherently have poor static stability and require precise interaction of the dynamic stabilizers, which coincidentally, is exactly what the above exercise accomplishes.
Key Coaching Cues: Placing a medicine ball on the floor, simply have the athlete place his/her palm on the ball and assume the quadruped position- locking their scapulae back (pack the shoulder). The coach will then GENTLY perturb the athlete’s arm, which in turn, will force him or her to dynamically stabilize the joint.
Just to be clear, let me reiterate that there is absolutely no need to go crazy. You don’t need to have an epileptic seizure here and try to knock the person off the ball. Rather, you’re just going to gently tap the upper arm and elbow for 5-10 seconds, and then switch to the opposite side.
Of note, I’ve placed this exercise at the beginning of a training session (as part of a warm-up/activation circuit), as well as at the tail end of a session (as part of a rotator cuff rehab/prehab/whatever you want to call it finisher). It’s not an overly taxing exercise, so I’d leave it to personal preference with regards to where to place it in a program.
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Comments ( 6 )
[...] Exercises You Should Be Doing: Quadruped Rhythmic Stabilizations - This blog from Tony Gentilcore features an exercise we’ve introduced in the past month since the seminar I did with Mike Reinold. It integrates “true” training for the rotator cuff along with an element of anterior core stability training. [...]
Stuff You Should Read: 12/9/09 | EricCressey.com added these pithy words on Dec 9th, 2009 at 12:55 pm |Frank added these pithy words on Dec 3rd, 2009 at 8:36 am |Tony,
Is this best worked in as part of the warm-up?
Neal added these pithy words on Dec 10th, 2009 at 11:38 am |Tony,
Would any unstable surface training (rings, trx, swiss ball) for the upper body do the same thing during any exercise?
jon added these pithy words on Dec 11th, 2009 at 11:20 pm |Tony, good post here. I agree that scapular stabalization is very often overlooked when dealing with the “shoulder”. Another variation of this exercise is to have the athlete lay on his or her side with the arm extended up towards the ceiling and then “perturb” or gently and randomly move the patients arm around. It is generally harder if you do this at the patient or athletes wrist. One VERY important concept with this is to make sure that the humeral head is centered on the glenoid fossa before and during the movement. Only continue with the exercise until the athlete can no longer stabalize the humeral head in the glenoid. I like the sidelying version also because the humerus is more perpendicular in the glenoid fossa than in the med ball version where it is more parallel with the plane of the glenoid fossa. The version that you show here would be a good version after the athlete is able to perform and master the sidelying version of the exercise. Great ifo though and keep up the good work!
Andreas Prezas added these pithy words on Dec 14th, 2009 at 9:43 am |I will add this exercise to my shoulder rehab exercises. Also, I will use it too after my bjj shoulder injury my shoulder is still not that stable, so this exercise will help.
Thanks,
A
Nick Chertock added these pithy words on Jun 15th, 2010 at 7:49 pm |Thanks for the good cuff info. Got any good ideas for scap stabilization besides wall slides? I’ve got way too much upper trap activity and zero lower trap strength, so my shoulders end up over my ears when I extend my arms overhead. I’m working on t-spine mobility, scap stability, and then worrying about my cuff since having a healthy cuff is impossible if I have Neaderthal posture.
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Tony Gentilcore is a Certified Strength and Conditioning Specialist (CSCS) and Certified Personal Trainer (CPT) through the National Strength and Conditioning Association. Currently residing in the greater Boston area and co-founder of