Nauli Kriya is intended for regenerating, invigorating and stimulating the abdominal viscera and the gastro-intestinal or alimentary system. For the practice of Nauli you should know the Uddiyana Bandha.
Vrischika is the Sanskrit word for scorpion. This posture is so named because the body resembles a scorpion with its tail arched above its head ready to sting its victim. Although it may not be a simple posture for beginners to perform, the Scorpion is not as difficult as it may at first seem.