Bali is THE place to practice and improve your yoga skills. There is nearly everywhere a yoga or mediation course. We can recommend visiting two centers, one in Ubud called Yoga Barn and the other one in Jimbaran near the University.
Yoga Barn Ubud
The Yoga Barn in Ubud is a immense yogi center and somehow another world. You can find every kind of yoga and meditation practice and lot of people from everywhere how wants to become a teacher. So, some friends and I decided to try the Fly High Yoga with Jose Luis Jimenez (founder of Fly High Yoga). With the special belt, you are able to do regular yoga poses (and other gravity defying moves) in a supported way. This makes the progression of your practice easier, more precise, more intense and more fun!
The Yoga Rescue Jimbaran
The Yoga Rescue is a hidden place in the center of Jimbaran. The nice thing about this Yoga place is that the classes are mixed with local people and also the teacher are mostly locals. As a student from Udayana you even get some discount. Next to that they have every Sunday at 7 am free classes at the GWK (Cultural Park).