Do you think that your headstand or Downward Dog was handed down from yogi to yogi for centuries, or when you're doing the Sun Salutation, you've joined the ranks of yogis who were practicing those same motions thousands of years ago?
Then think again.
When I tell people that I'm the founder of Core Strength Vinyasa Yoga, a style I created to draw students back to the powerful experience of their center in every pose--I commonly get two types of reactions.
The first is, "Sounds great! I'd love to try it." The second, though a minority, tends to be quite vocal. They sputter, "How dare you tinker with the classical postures of this sacred, ancient practice? Who do you think you are? Krishna?"
It's a good question, and one I'll answer, finally, here.
But first, a little about my perspective on the poses, and why I think it's perfectly fine to do with them as I wish:
In my teacher trainings and classes, I not only give instructions about the classical poses like Triangle or Revolved Half Moon...in some cases I improve upon them. I do this by showing students who might not be flexible or strong enough to look like a Yoga Journal cover model some effective modifications like bending the front knee in Half Moon Pose so the student can reach the ground and the core can be properly activated.
http://www.huffingtonpost.com/sadie-nardini/your-yoga-poses-arent-500_b_272821.html