Urdhva Mukha Svanasana and Bhujangasana

What are the differences between Urdhva Mukha Svanasana and Bhujangasana? Urdhva Mukha Svanasana (Downward Facing Dog) has Knees, Thighs and Hips lifted away from the floor with the help of the toes and straightened arms. Bhujangasana (Cobra) has them rested on the floor. Urdhva Mukha Svanasana maintains a straight line running from shoulders to the wrists by keeping the elbows straight. Fingers are spread, facing forwards with knuckles press down. Bhujangasana has elbows close to the body and the chest is lifted away from the floor with bended elbows to help lengthen the spine. Hands are pulled back and triceps are engaged. What are the similarities between Urdhva Mukha Svanasana and Bhujangasana? In both asanas, lower abdomen is lifted and lower back is lengthen, this allows tailbone to get lengthen as the spine extends. Chest reaches forwards and upwards with the legs reach back with toes pointed and feet pressed down. Compared to Urdhva Mukha Svanasana, Bhujangasana is an easier pose hence is suitable for beginner who is in process of developing upper body strength and core control. While Urdhva Mukha Svanasana is more suitable for seasoned practitioners.   Louise (200h Weekend YTT July 2015)