A strong lower back will help keep your hip flexors and core in good shape for training, as well. Since your upper back has far more muscles to train and build, your lower back can often be more important to strengthen and support. When your middle and lower back muscles are weak, you are more likely to experience low back pain. Strengthening the deeper muscles of the back, particularly the erector spinae, multifidus and quadratus lumborum, develops support for your spine and pelvis.

A strong lower back will help keep your hip flexors and core in good shape for training, as well. Since your upper back has far more muscles to train and build, your lower back can often be more important to strengthen and support. When your middle and lower back muscles are weak, you are more likely to experience low back pain. Strengthening the deeper muscles of the back, particularly the erector spinae, multifidus and quadratus lumborum, develops support for your spine and pelvis.

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