I do Hatha yoga every day. But Siddhis, Chakras and all the Nirvana crap, nah. Fantasies.
Here are some Siddhis
Doorshravan: to hear, sitting at one place, speech from however distant a place.
Dudarshan: to see simultaneously events and things in all the realms.
Manojava: the body can travel at the speed of thought to any place.
Kaamaroopa: to assume any form. Shapeshifting.
Parakayapravesh: ability to enter into another's body, whether they are dead or alive.
Swachchandamrutyu: to die at one's own will, death having no control over one.
Sahakridanudarshanam: to see the sports of gods in heaven and have capacity and prowess to participate in it.
Yathaasamkalpa samsiddhi: to attain whatever is desired.
Ajnaapratihataagatih: whereby one's command and movement have no obstruction
Anima: the reduction of one's form to one atom. Invisibility
Mahima/Garima: the body can be made to be very heavy.
Laghima: the body can be made to be extremely light
Prapti: abilty to acquire objects of sense pertaining to the respective organs.
Prakaashya: to see invisible things in other realms.
Ishitaa: to stimulate bodies and creatures Control of forces of nature.
Vashita: to have control or dominion over the senses.
Yatkamastadavasyati: To obtain joy by willing it so. The cessation of misery and desire. This is considered to be the highest state of bliss
They forgot Conmanama: The ability to get sums of money out of gullible Westerners.