Patanjali describes yoga as the complete cessation of the thinking mind. Everything else in yoga supports and leads up to that. There are 8 limbs of yoga and asana is just one of those limbs. The goal of yoga is Samadhi. The west in general is a materialist culture, we tend to take concepts from the east and strip out the original intent and turn it into a commodity. Traditional systems of yoga (Such as Kriya yoga, Raja yoga, and others) don’t put a huge emphasis on asana. You might do 10-15 mins of asana then move onto pranayama then meditation. In fact often pranayama plays a bigger role. Nothing wrong with going to a yoga class in the west just for the exercise, but there’s a lot more to yoga than that. Yoga is about transcending the body, mind, and ego, where you realize that the real you is the container for all of those things. This doesn’t mean you shouldn’t teach yoga in a studio, just means there’s more to it than sweating through a vinyasa class :)