Bow :: Dhanurasana
Both halves of the body are simultaneously raised by the tension created when the legs and arms resist against each other. Notice that the hands are on the outside of the legs and that the thumbs are pointing toward the ground. This pose tones the back muscles and stretches the chest, shoulders, hips and legs in a way that promotes good posture and vitality. Balancing the body weight on your abdomen on a regular basis will decrease the likeliness of your body storing abdominal fat and keeps the digestive system working smoothly. The more advanced version of the bow has the knees and the chest lifted higher than shown and has the knees together rather than slightly apart.
Once you’re in the pose (to whatever degree you can) allow your breathing to expand your abdomen and to cause a rocking of your entire body. Do not use your head or other body part to rock. It is only from the expanding and contracting of your belly through breathing that this rocking should take place. Be subtle with it.