Low back pain commonly is experienced in the back itself. However, due to the complexity of the spinal cord and associated nerves being an intricate part of the low back, pain may and frequently can radiate or travel further down the course of the nerves. This is similar to striking your "funny bone" in the elbow and feeling the sensation in the hand below the elbow.
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A sedentary lifestyle can lead to having weak and tight hip flexors as they are always in the shortened position. Tight hip flexors can lead to a limited range of motion, poor posture, lower back and hip pain, and even injuries. These muscles need to get a workout when you are standing and doing movements such as raising your leg to climb stairs, run, or ride a bicycle.