Posture is the position of the Buddha in which Buddha holds his body when standing, sitting,walking, running and sleeping.
According to the modern practice there are two kinds of posture to hold your body. Dynamic posture and static posture.
Dynamic posture is how you hold yourself when you are moving, like when you are walking, running, or bending over to pick up something.
Static posture is how you hold yourself when you are not moving, like when you are .