Give this exercise a try for your back pain. You should not feel any sharp pain when doing this exercise; if you do it correctly you will feel muscle soreness in your lower back and hamstrings. Do not lift your arms up all the way like the woman does at the end. That increases the workload on the lower back. Just keep your hands on a desk or chair in the beginning. Do this 3 times a day morning, noon and night. Once you get used to it, you can do it once each hour. Contact me if you have questions. Let me know if this helps.