Erector Spinae: Intermediate muscles that help with flexion of your rib cage, upper vertebral column, and head. Longissimus and Quadratus Lumborum: Deep muscles located around the lower back.

You need to put your back into it. The deep muscles of your back – the erector spinae – help to provide postural control and stability. This is especially important for runners as it prevents ...

When you hear the words “deep core activation” during workouts ... Some examples include the erector spinae (muscles that hug your spine), transverse abdominis (a belt of muscles beneath ...