Overriding with Extension Method

I want to override Rigidbody2D.MovePosition(). My best thought is to have an overriden extension method, but is this possible? The following don't work...any ideas?

 //Doesn't get called
 public static void MovePosition(this Rigidbody2D rigidbody2D, Vector2 vector2)
 {
     Debug.Log("Moving Position");
 }

 //"A static member '...' cannot be marked as override, virtual, or abstract"
 public override static void MovePosition(this Rigidbody2D rigidbody2D, Vector2 vector2)
 {
     Debug.Log("Moving Position");
 }