While clearing my stuff, I found this very useful piece of information which I had kept for more than 30 years.
This exercise is very effective in relieving aches and pains in the lower back. I have practised it for past 30 years.
Kneel on the floor with knees six to eight inches apart. Bend your torso forward from the waist stretching your arms out in front of your head so that your forehead and most of your arms are on the floor. Your upper body slope down from your hips to the floor. Press your chess as close to the floor as you can（as shown above). Your upper torso weight should be on your hands. Relax for 1 to 3 minutes. Repeat as many times as you like.
It is a Yoga-like pose and it is very effective.