Many will experience low back pain, stiffness or tightness at some point in their life. A tight lower back is tough to avoid, as daily activities, such as walking and sitting, can lead to this issue. Prevention is key to avoid this condition and stretching can help to shun tightness. Lie on your back with your knees bent. Gently lift your feet off the floor. Pull both knees towards your chest with your arms. If you feel pain, stop immediately. Otherwise, relax and hold for 30 to 60 seconds. Do not perform this stretch if you are pregnant. This exercise can also be done one leg at a time.