(Image credit: Shutterstock) Like millions of other people, I’m guilty of spending too long slumped over my laptop or smartphone, then wonder why my lower back feels incredibly stiff. According to my yoga teacher, the sphinx pose is the gold-standard move when it comes to reversing the hours of sitting, running, and carting a toddler around on one hip. To find out more, I added it to my routine for a week — read on to find out more. As a reminder, what works for me might not be right for you and your body. If you’re pregnant or postpartum, or you have suffered any sort of lower back injury in the past, it’s always best to seek personalized advice from a qualified professional. What is the sphinx pose? (Image credit: Shutterstock) The sphinx pose is a gentle, beginner-friendly backbend that focuses on strengthening the spine and stretching the abdomen and chest. It’s ideal to do at the end of the day if you’ve spent a lot of time sitting down behind a desk.…