I'm interested to hear about empirical or practical experience with regards to:
1. Chaturanga dandasana, specifically the directive to not let your shoulders sink below your elbows, or to always keep your triceps parallel to the floor.
2. Utkatasana, to tuck in the tail.
I'm curious as to whether these directives are still valid in 2010.
If anyone has any other alignment-related cues they're curious about, post 'em in the comments.
