And, a great challenging posture or asana is headstand or sirshasana. If you're just starting out doing this posture, I highly recommend bringing your mat towards a wall. And, even as an advanced practitioner if it's something that you?re new to headstands it's a good thing to have a wall nearby; helps with your confidence. So, slowly come forward and what you'll do is grab your clasp your palms. And, bring your elbows about shoulder width apart. And, this clasping of the palms can act as a slight cupping for the back of your hand if need be. You slowly bring your head down towards the mat and bring your bottom towards the sky. And, then what you'll do is you walk your feet in until you can lift them off the ground. So, find that space on your head and find where your elbows need to be. And, then slowly bring your legs towards the ceiling lifting up out of your arms. So, you don't want a lot of weight on your head. And, reach your energy. You can flex your feet and reach your feet towards the ceiling. And, then as you're ready fold your legs back in. And, the challenging part is trying to bring your legs back down in a slow fashion and not crash towards the earth. So, as you first start out another great way to do this if you have a wall is to face your behind towards the wall. Come to that position, straighten your behind towards the wall and walk your feet up towards the sky onto the wall. So, that will also give you confidence. And, if you have a partner that can help spot you that also helps. And, that's headstand.