WOD = 3 rounds for time of:
-15 GHD hip-back extensions (no momentum) *
-21 GHD sit-ups
*GHD Hip extension, back extension and hip-back extension review: https://paradisocrossfit.com/2011/04/05/hip-vs-back-extension/
scaling options for those who have to break GHD sit ups or extensions in to 4 or more sets or who have pain or structural impediments include hollow rocks and arched body rocks respectively.