Such as the Cobra pose (pictured) to loosen up the back muscles. For me, this along with a few others I mentioned before is awesome for gaining flexibility in the lower back. It is a basic yoga pose, but an essential one, especially for those starting and those with back pain. There is not one session that I do without it. Basic stretches like the Cobra made something seemingly difficult like the back bend possible; and they are now helping in reaching my next goal: the chest stand.
My hamstrings stretching was not always this linear. It took *time* to get to where it is now. Flexibility does not happen overnight, so do not become discouraged if you find yourself incapable of pulling something you see in a picture or a video. Results can come in days, weeks and even months, depending on the pose and difficulty. And like I mentioned in the beginning, there is always room for growth for any pose.
The only true "hard" part is setting aside at least 15 minutes a day for stretching.
♥ Bambi