LIke the single leg kick, the exercise stretches the from to the body. There are a few added challenges. This one also includes thoracic extension. So you are lifting your chest off the floor without the aid of your elbows to support you. You also roll the shoulders back, creating length across the pectorals muscles. In this version we also add cervical rotation, (neck). Then finally, bending both legs at the same time gets the whole front of the hip open and can challenge tight quads and help flexors.