I don't usually post 2 blogs in 1 day, much less one week; however, this guest post by Geoff Neupert, Master RKC, answers one of the most frequently asked questions prospect students tend to ask their RKC instructors.
"Will kettlebells hurt my back?"
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SCIENTIFIC STUDY: Kettlebell Swings - Good or BAD for your back? (Surprising Results)

Happy Monday!
I ran across an interesting scientific study this weekend. Here's why it's important to you. One of the reasons I went to the RKC back in 2005 was because the 2H Swing hurt my lower back. I just couldn't swing without pain. Weird, huh? Especially when you think about all the people who have "cured" their low back pain with kettlebells. So which is it - are Swings good for the lower back or bad?
They found that unlike traditional barbell lifting, kettlebell swings, the loads on the spines are
"inverted."Because of the arc-like trajectory of the Swing, there is relatively high posterior shear forces* in relation to compressive forces. *In "regular speak" shearing force is a force that can tear. Compressive force is just that - compressing material together until it explodes/ruptures.
In traditional barbell lifting, there are higher compressive forces compared to shear forces. So what does that mean? It means, according to the researchers that you should have sufficient spinal stability - and sufficiently more spinal stability to swing a kettlebell than lift a bar.
So what's that mean for YOU?
1. Compressive forces are traditionally associated with back injuries - herniated discs.
Kettlebell Swings have low compression forces, therefore, when done correctly, they won't hurt
your lower back. They're more "forgiving" than barbell lifting. And that means that you can do a lot of them to strengthen your back and keep yourself from getting injured. This explains why so many people experience positive results from Swings.
Cool.
BUT...
2. Shearing forces can still cause back injury, so if you're swinging your KB and have back pain,
stop swinging!
Your pain most likely means that you either have insufficient spine stability and/or your technique
is incorrect. This means Swings actually ARE bad for your back in certain cases. And this explains why there are some people who find that Swings and kettlebell ballistics in general hurt their lower backs.
So...
3. If you even suspect you fall into category #2, you need to add in some spinal stability exercises and polish your technique.
Well what about my Swing? Did it get better after going to the RKC? Did I have a spinal stability problem or a technique problem? I had been doing a bunch of spinal stability work so for me it was learning how to "wedge" myself between the ground and the kettlebell that cured my back pain.
Keep your eyes peeled because I'll be sending you some "interesting" ideas to help you polish your
Swing and your other kettlebell techniques.
Talk soon.
Geoff
P.S. The other cool thing about this study is that Pavel was actually in it - I think he was
used as the control - but don't quote me on that.
Anyway, the point is, some of the numbers you can get with a Swing - especially 1 arm Swings, is quite
surprising.]
Geoff is a veteran fitness professional of 16 years who's been all over the map: Personal Trainer, Divsion 1 Strength and Conditioning Coach, Competitive Weightlifter, Business Owner, Kettlebell Instructor, Member of the RKC Staff...
Geoff has created tons of fascinating online and printed resources on reaching your performance and body composition goals with the almighty kettlebell.
Check out;
Kettlebell Burn , Kettlebell Burn 2.0, Kettlebell Muscle, Kettlebell Secrets
You can read Geoff's blog at Chasing Strength where he posts; "Cool Stuff To Make You Stronger, Leaner, and Even Better Looking…"