There are major eight sidhis of Pranayam when done perfectly viz., Anima, Mahima, Laghima, Garima, Prapti, Prakamya, Vasitvam and Isitvam. Anima is the power to become as minute as you like, whereas Mahima makes you as big as you like. By Laghima you can make your body as light as a feather and fly in the sky thousands of miles in a minute. Garima can make your body as heavy as a mountain. By the power of Prapti you can predict all future events, understand unknown languages, cure any disease, hear distant sounds, see distant objects, smell mystical fragrant odours, touch the sun and
the moon with the tip of your fingers from where you stand, and understand the language of birds and beasts. Indeed you can attain all desired objects. By Prakamya you can cast away the old skin and assume a youth-like appearance for an unusual length of time. You can also enter the body of another person. Sri Sankaracharya had this power. He entered the body of the Raja of Benares. Yayati, Tirumulanar and Raja Vikramaditya had also this power. Vasitvam is the power to tame wild beasts and bring them under your control. By the
exercise of this power, you can make anybody obey your orders and wishes. You can control the elements and be a master of passions and emotions. Isitvam is the attainment of all divine powers.

You now become the Lord of the universe. You can give life to a dead man. Kabirdas, Tulasidas, Akalkot Swami and many others had this power. By possessing this power you can penetrate all secrets of nature, know the events of the past, present and future and become one with the Supreme Soul.