The GHD may be best used for low rep, explosive out of bottom end range to hip extended end range movement. The key to this exercise is to understand the importance of holding a stable (neutral) posture at cervical, thoracic, and especially lumbo/pelvic position throughout the entire exercise as you engage high force/high threshold motor unit recruitment at the hip complex (posterior). Think sprint work and the high ground forces applied at each explosive stride and the use of the GHD makes a lot of sense. Using the GHD as a movement for hypertrophy work though may not be the best choice… Constant tension 45 degree hip extension and RDLs have shown to do a much better job of getting after that goal.
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