Planks can be a safe and effective exercise for your lower back, if modified according to your needs, abilities, and goals. However, it is essential to listen to your body and monitor any signs of pain or discomfort. If you experience sharp or shooting pain, numbness, tingling, or weakness in your lower back or legs, stop doing planks and consult a doctor or a physiotherapist. Additionally, if you have any acute or chronic lower back conditions such as herniated discs, spinal stenosis, or spondylolisthesis, it is best to avoid planks unless you have clearance and guidance from a medical professional. Furthermore, pregnant women, postpartum women, and those with diastasis recti should modify or skip planks and follow a specific core rehabilitation program. Lastly, it is important to rest and recover adequately between plank sessions and not do planks every day as this can lead to overuse and inflammation of your lower back muscles and joints.