It is interesting to view the legs of the Icelandic Horse in slow motion. Conformation problems may cause the transverse legs to cross over each other (rope walking), and the style of riding with mechanical aids, or the pounding of the feet on the ground may cause the joints to hyperextend (such as seeing the bottom of the front feet from the front, as in the above picture, not a good thing).
Take a look at the picture and figure out which leg is which and what the flight pattern is of each leg. Do the legs looks like they are tracking up? travelling on one, two, or three tracks? or cross-tracking?