

Happy Hump Day! One of the hardest days to get through the gym, but here we are. Today we worked on lower back. These muscles sit deep under your skin. The intrinsic muscles include the erector spinae group and the transversospinalis group. These muscles go up and down along your spine on either side of your spinal column. There are several muscles in each group, including the multifidus muscles in the lower back muscle anatomy.