It depends on where you need to focus. My shoulders are very mobile, so I don't do too much there. I focus on my hips, hammies, and inner-thighs. My favorites are triangle, downward dog, and a straddle with forward fold. I like to sit on a pillow or yoga block when straddling because it helps my fold my pelvis forward.
A good friend is a yoga instructor, certified TRX, certified acro yoga, etc. A very athletic approach to say the least. We've done a few privates and I have a few great full body nightly routines she's developed for me, but the bang for the buck movements for me are the three above.