Many of us, when we do yoga, "think" with the front of our bodies. So when we are asked to open the back of our bodies, we unconsciously try to manifest the instruction on the front body. In some cases this is simply because our minds aren't used to thinking about the back of the body (out of sight, out of mind!). Or we may have tightness in the back body, and so we try to compensate with the front body.
The example I want to look at today is a common one: when working to stretch the backs of our shoulders, or when moving into a backbend, we lengthen our spine, lift our collarbones, and let our lower ribs "flare" or "pop" out. It feels like we are stretching more deeply when we do this, but in fact we are using our ribs as an "escape valve" to compensate for tightness in our back body.
So, what's the big deal? Well, when this "escape valve" becomes a habit, you will carry it with you throughout your practice, including into more challenging poses like backbends. When the lower ribs are "popped", your lower back isn't being stabilised by its synergists, the transverse abdominals. This can cause excess load to be carried by the lumbar spine (the lower back), which can possibly lead to strain or injury. You want to be especially careful of this if you (like me) tend towards a "curvy" lower back in general, because it can also mean that your back is taking undue strain even in postures that are not backbends (and probably in your day-to-day life, as well).
In either case, this is really simple to correct once you're aware of it: use your abdominals to pull the lower ribs back in and down and keep them close to your body. Then go back into the pose, staying aware not to let your ribs flare out again.
Clear as mud? Have a look at the pictures!
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