Here Dr. Shawn Allen of The Gait Guys further discusses this gait problem in running form. The Cross-over gait is a product of gluteus medius and abdominal weakness and leaves the runner with much frontal plane hip movement, very little separation of the knees and a "cross over" of the feet, rendering a near "tight rope" running appearance where the feet seem to land on a straight line path. In Part 2, Dr. Allen will discuss a more detailed specific method to fix this. You will see this problem in well over 50% of runners. This problem leads to injury at the hip, knee and foot levels quite frequently.