Tight hamstrings pull on your lower back and cause pain. If you can't sit on the floor, your hamstrings are too tight. Stretch them two to three times daily to fix it.
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A lot of you have been struggling with a lot of back pain. While I've showed you a lot of back strengthening exercises, I want you to know that one of the biggest causes of back pain are very tight hamstring muscles, back thigh muscles. So the moment you feel that you're not able to sit on the floor, that means your back thigh muscles are very tight because you've not stretched them in a long time, and that causes back pain. All I want you to do is stretch your back thigh muscles so that you can relieve yourself from the back pain that you're having. Just do this 2-3 times in a day and it will help you tremendously.