The starting position is lying on the back in a hollow. A hollow position for this purpose is one in which the pelvis is turned under (i.e., tail tucked), legs are lifted slightly off the floor, lower back is touching the ground, head and shoulders are lifted slightly off the floor, and arms are held by the ears, off the ground. From this position, rock smoothly back and forth, keeping the body tight, the hip angle constant (no piking of the hip), and the lower back rounded. Any thumping in the motion shows that the hollow position has been compromised, which indicates that the trainee�s abs are not strong enough to keep the pelvis turned under in this position. Continued training will alleviate this deficiency.

CrossFit Journal Articles

  • Three Important Ab Exercises
    Many so-called experts completely misunderstand the vital role of the hip flexors in controlling and motivating athletic movement. They miss the complex interrelationship between the hip flexors and the abdominal muscles.
  • The Moves
    The CrossFit movements are functional, full-body movements that generate a great deal of power, and virtuosity in these movements requires instruction, practice and refinement. The movements are tremendously effective for producing fitness, but they are c

CrossFit Level 2 Certificate Course

The movements page is a breakdown from your workout programming. It is a great tool for analysis, but it does not show you how to effectively design, scale or evaluate your programming. We highly recommend attending the CrossFit Level 2 Certificate Course to learn how.