The ‘Asta siddhis’ that are described in our ancient yoga books are: Anima, Mahima, Laghima, Garima, Prapti, Prakamya, Ishitva and Vashitva.
‘Anima’ gives one an ability to make ones body incredibly small, even smaller than an atom.
‘Mahima’ gives one the ability to make ones physical body as big as one wishes. It is a known fact that with such amazing power Lord Krishna displayed his ‘Vishwa Roop’ in the battlefield of Kurukshetra to Arjuna.

With ‘Laghima’, a yogi can make his physical body as light and
with ‘Garima’ as heavy as one wishes.
With ‘Prapti’, one can acquire any material items in the world.
‘Prakamya’ gives power to satisfy any wish one has in his mind while
with ‘Ishitva’ he can rule over any one.
With ‘Vashitva’ a yogi can control anyone’s mind and make him work according to his wish.