Classes are held weekly at Calgary's Dickens Pub on Mondays and Wednesdays and feature a slower paced yoga style "with more F-bombs" and welcomes students to stay around for a beer afterward.
Istace first developed "Rage Yoga" as a way to change the culture of traditional yoga to better fit her personality.
"When I started going to yoga classes, I felt like I didn't really fit in at a lot of those different studios," Istace, a trained fire eater and contortionist told CBC. "[There's a] very deadpan, serious, overly serene approach to things. And that's just not how I roll."
Classes cost $12 for drop-in visits and $55 and $100 for 5 and 10 class passes respectively. Her classes usually see around five to 12 students and she is planning to launch monthly online classes in March.
Istace also told CBC that some yoga teachers disapprove of the practice, but said she and her students enjoy the unorthodox style just the same.
"They don't really think that it's real yoga, that swearing and drinking beer makes it illegitimate. And that's fine," she said. "Everyone's entitled to their own opinion. Different things work for different people and not everyone has to be on board."
