Each Yoga posture has its own secrets which are revealed to us only if we learn about its actual name and its meaning. Each postures name and pose is an analogy to some natural phenomenon. If we understand the name and also watch that natural phenomenon we'll understand how it is to be performed.
Yoga is quiet close to nature and yoga postures bring us close to nature without leaving our present physical location. If we perform each Yoga posture in its intended form then we can feel Yoga in our day to day life. Yoga postures are not like exercise routines which are just limited to physical well being. Yoga postures are much more than that (how much more/less depends on each person).
Learning Yoga in its actual form and with its actual meaning will not only provide a healthy body but also a peaceful mind and calmness in soul. Exploring Yoga is like exploring nature.