Back feeling achy or tight? Thankfully, it's simple to stretch your thoracic spine (the middle section, from the base of your neck to the bottom of your ribs): Just do a round of Cat Pose to Cow Pose, more commonly referred to as Cat-Cow pose. As a yoga instructor, Cat-Cow is one of my favorite ways to begin class, since the combination of these two poses helps warm up your spine and relieves...

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