A key component in maintaining strong, healthy shoulder joints is understanding how to differentiate between using actual shoulder mobility v. other joints to compensate for a lack of shoulder mobility.
As the above photos demonstrate, more than one joint can be used to reach arms overhead. Many of us mistakenly believe we are strictly using shoulder mobility to accomplish this motion. The first photo shows someone reaching arms overhead to touch the wall behind them. At a glance this might look like fantastic shoulder mobility, but take a closer look at what is happening at the rib cage. It moved away from the wall to help move the arms further overhead. Once the end of actual shoulder mobility is reached, rib cage thrusting can help us achieve further movement without using the shoulders but using the low back instead.
Is this a problem? Not always. But if you are looking to improve actual shoulder joint mobility, compensating with rib cage thrusting bypasses the...
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