When we first roll over onto our bellies and begin lifting our heads and then our upper bodies off the ground, we develop the two concave curves of our spine and open ourselves to the outer world. (yogauonline.com)
The Boxster's distinctive concave curve at the bottom of each door has now gone - in fact, the doors are shared with the 997. (evo.co.uk)
Some of these thicker cloth options might elevate baby's hips, create a concave curve of the spine and affect weight distribution in Tummy Time in the very early weeks. (candokiddo.com)