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Go down on your left knee and place your right foot straight in front of you, as if you were doing a cheat version of the splits. Touch your right foot with both hands and then try to touch your knee with your forehead. Hold this pose for at least 15 seconds.  Bring your left arm over your body and try to touch your right foot. Hold this position, then turn as far as you can to the right and hold again. All of your muscles work in tandem together – so stretching your other muscles (like your leg and core muscles) will help improve back flexibility. Having a strong core will allow you to work on your back flexibility by being able to engage in more poses and stretch further into your poses. Go into a lunge position and push your pelvis down towards the ground. If you feel pressure or pain, lessen the degree of your lunge. Sit back onto your bended knee and stretch out your front leg. Try to put your forehead to your front knee – you should feel a stretch in your hamstring. From this position, try slowly going down into the splits. Go down as far as you can without hurting yourself and hold this position for 30 seconds. Remember that all of your muscles work together to make one strong body – so a flexible, strong back requires flexible, strong muscles in other parts of the body as well. If you can't quite get down into the splits or reach all the way to your toes, that's fine. The more you practice and work on your stretches, the more flexible you'll become. Don't try to force yourself too hard into stretches you can't handle. You don't want to injure yourself.

Summary:
Try a standing split stretch. Work your way down to floor splits. Adjust the stretches to suit your specific needs.