Yoga Classes in Northern Kolkata?

A very good friend of mine is desperate to join Yoga Classes and the saddest part is that she wants me to join, and being her good friend, I couldn’t deny her. We stay in Northern Kolkata but I don’t know any place where we can go for ‘Yoga’ classes.
If anyone of you know any yoga centre, lemme know.
p.s. also do tell me about how to get myself rid of these yoga classes.:thumbsup
Love,
Sreejata.