Aadil says, the purpose of asana is "to help the body be a better vehicle for the spirit's command. Why do we practice? We practice for the exploration, discovery and fulfillment of dharma."
1. To learn if your practice is serving you, look at your life -- what is the state of your relationships? --That is, your relationship with family, with the earth, with food, etc.
2. To choose your teacher, don't look at the person's practice, look at the person's life.
3. Don't knit the ribs together during practice under any circumstances -- we want to expand the heart center, not contract it.
4. Never practice Uddiyana bandha while actively breathing -- it strains the heart. (During pranayama, it is done while holding the breath out.)
5. The best way to cultivate the rasa, or juice, in standing poses is by using the quadriceps. Bring the earth energy up into your legs using the quads, then into the pelvis, then knead that energy into your heart.
6. Don't send all of your prana, or lifeforce energy, out around you, tilt the pelvis up and send the prana into your heart.
Finally, some food for thought from Aadil: "It's a magnificent cosmic evolution which we are a part of, usually dragged kicking and screaming; but if we choose to participate, the suffering will end."
You can read the rest of the article here. You can visit Aadil's site and learn more about Purna Yoga and his teaching, here.