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The inspiration for all that deep groin release in class this week was this post from Anna Karkovska McGlew at fleshcontext.

"...this is an active groin release, not a passive one. It involves a strap, so go get one (the longer the better; if not, you might need to connect two straps to make a long one). The video will show you how to loop the strap around your feet, shins and thighs. Notice that the heels are not together in this variation, only the toes and the balls of the feet are touching, the heels never touch. Once you get there, anchor your upper arm bones against the floor. As you pull on the tails of the strap, actively press the balls of the feet into each other and resist the heels away from each other (same idea as above). At the same time, lift your heels away from the floor, as if someone is prodding the outer heels and the outer edges of the feet up from underneath. By this time, you will probably feel a stretch from the pubic bone through the upper inner thigh. Don't forget to breathe and keep space between the upper and lower jaw. Also, your buttocks will be working, but don't confuse working with overworking and gripping. If you feel like you are gripping, think of broadening the buttocks away from the sacrum and lengthening the center of the buttocks away from the top of the pelvis in the back. Finally, check once or twice to see that the heels are evenly lifting away from the floor. Often one will be higher than the other, as in the upright version--you  might also be able to discern this from the tone of your buttocks against the floor/mat..."

It's been helping me with my hip movements in overhang climbs too.