Starting with sweat

"Penetration of our mind is our goal, but in the beginning to set things in motion, there is no substitute for sweat."
- B.K.S. Iyengar

From a CNN interview:

I saw lots of people practicing yoga where there is absolutely no foundation or firmness in the presentations, and I thought that this type of yoga is not going to help anyone, because it's going to die, because it's like a dust, gathering dust. So I made up my mind, that in order to attract people, I said that each and every fiber of my body, while presenting the asanas, without contortion, without distortion, without attraction, that each and every part of our fibers, sinus, muscles should run parallel to each of them in the core areas. So I started practicing to bring alignment on the joints, on the wrists, on the fingers, on the muscles, on the right and the left, the back and the front... Then it gave me an idea that asanas have to be presented in a measured form.Something struck me that this is not enough, so I had to bring my mind and my intelligence to spread as I stretch, to contract as my muscles contract. And that created a new dimension of presentation, and that new dimension of presentation attracted people more and more. They realized that the body has to be balanced to the level of the mind, and it should be in par with the intelligence of the highest wisdom.