Studying yoga in India

I am looking to study yoga in India for 1-3 months. I’m not set on a particular style as of yet, although I am attracted to more physically demanding types such as Ashtanga. I’ve heard that Rishikesh is the capital of yoga. I was wondering if anyone wanted to share their experience about yoga in Rishikesh or India in general. I was also wondering if it was best to set something up beforehand, or if I could perhaps just show up in a place like Rishikesh, and try out different ashrams. Any advice would be much appreciated! Please feel free to share any experiences about yoga in India. Thanks.