Movement with Breath and proper alignment. What I have observed is that many yoga participants move beyond the control of there breath and forget (or are not aware) of what it means to maintain a neutral spine. At every class I attend I see people pushing beyond where they should and as an instructor in training I must take this awareness into my classes when I begin teaching. You should 'stretch' yourself, this is the point of stretching in general, beyond normal lengths and to a point of discomfort but do not jump over the edge.
So, today I took my father to do yoga at Yoga is Youthfulness in Mountain View, a nice studio with good instructors. We did a nice class that allowed us to move into our stretches and challenge ourselves and repeat the posture. The instructor moved at good pace with a good explanation of the postures and demonstration. Class took an 1 hour and 15 minutes and I feel the difference. I focused on staying within my breath and a strong concentration on my body within space. Walked in tight walked out mobile.
Awesome to work with my dad and see him out at 67 working to improve himself.
PS: The instructor noted that I need to not lift so much weight, it is holding back my flexibility....lol guess she does not know me well :-)