CORE CHALLENGE! Single-arm GHD Turkish Sit Ups are a killer core exercise. They take the standard GHD Sit Up to another level by having you fight rotation while adding an external load.
3 GHD Abs Exercises to Boost the Power Your Abdomen
CrossFit | The Glute-Ham Developer Sit-Up
20 Punishing GHD Sit Up Abs Workouts for CrossFit Athletes | BOXROX
CrossFit | Training the GHD Sit-Up
How to do GHD Sit-Ups on the Glute Ham Developer That Will Maximize Ab Strength - YouTube