Exploring the core - front, sides, back and... top and bottom.
Can activating the core help with the step through in sun salutations?
And a little on the Yama Satya. (The Yamas, and their complement, the Niyamas, represent a series of "right living" or ethical rules within Yoga philosophy. It means "reining in" or "control". These are restraints for proper conduct as given in the Vedas and the Yoga Sutras. They are a form of moral imperatives, commandments, rules or goals.)
There's an into to the core at the beginning of this video - if you'd like to skip it just slide the play arrow to 3 mins.
Enjoy!