Hi, I'm Juliet Kaska, and this is what muscles need to be warmed up in preparation for back bends in yoga. Doing back bends is a wonderful exercise to help lengthen out and stretch your spine, and help open up your chest -- which, as we all know, gets very tight from all these hours we spend working at the computer or hunched over in the car. In order to warm these muscles up, we need to work on stretching our hip flexors, our spine, and also our chest. So, the first exercise we're going to do to help prepare us for our back bends is called Crescent Pose. Step your right foot forward, and step your left foot back. Sink down into the right leg, until your right thigh is parallel to the ground. And, you should be up on the back toes, putting all the weight into that right toe, and then reaching your arms up and overhead, extending up through the fingertips. And, you'll feel this nice deep stretch across the left hip flexor -- one of the muscles that we need to stretch in order to do our backbends. So, our next exercise is called Up Dog. You're going to place your hands on your mat, with your thumbs right next to your armpits. Your face will be down towards the mat. On the exhale, you're going to press down through the tops of the feet and the legs and the hands, and lift your chest up, just like this. Lift your chest up towards the ceiling. Think about length coming out of the tips of the toes, and out through the crown of the head -- not dumping into your lower back. Keep pulling the shoulder blades together in your back to open and expand your chest and stretch your spine.