Stand erect with your hands resting on the sides. Taking a deep breath, bend forward, allowing your body to fall off from the hips. Allow your hands to touch the floor. Stretch your right leg backwards first, and then stretch out your left leg. Allow your palms to be placed on the floor firmly. Balance yourself on the toes and stretch till you feel a tingle on your hamstrings. Your head should face the ground with your chin touching the chest. Breathing normally, relax while trying to stretch your back by pushing the shoulders and head inwards. Exhale and come back to the starting pose. One of the best yoga asanas for back pain.