Lower Back Muscles / Fixing Hip Low Back Pain In Runners Potomac Physical Medicine . So what is low back strain? In addition, strong back muscles contribute to a strong core. This helps prepare your muscles, and the rest of your body aim to do this lower back workout twice a week. This gives your back muscles time to fully. Lumbar (lower back) muscles are spinal rectifiers. Lower back extensions are almost the same as the previous, but instead of holding you do it for back lever is another useful move to strengthen your spine and lower back muscles, though it. So what is low back strain? Within this group of back muscles you will find the latissimus dorsi, the trapezius, levator scapulae and the rhomboids. However, the spinal erectors travel the length of the entire spine. Since the muscles in your lower back are part of your core abdominal muscles, you can't strengthen your lower back without strengthening your core.8 x trustworthy source harvard medical school....