The reverse crunch strengthens your abdominal muscles while placing less strain on your back and neck than a regular crunch. You can see Thomas starting in a hollow hold and lifting his knees to chest, then back to a hollow hold.
WOD: A. Back Squat – 70% x 10 x 3 B. Overhead Squat – 65% x 3 x 2, 70% x 3 x 3 C. Post Core work: Tabata reverse crunch on cage 20x10x8