During the cradle warm-up the outer ankle is often overstretched. Push through the inner edge of the foot against the upper arm to equalize the two ankles. Then when you bring the foot across into the opposite groin, see that you maintain this even stretch of the inner and outer ankles.
Calms the brain
Stimulates the pelvis, spine, abdomen, and bladder
Stretches the ankles and knees
Eases menstrual discomfort and sciatica
Consistent practice of this pose until late into pregnancy is said to help ease childbirth.
Traditional texts say that Padmasana destroys all disease and awakens kundalini.