Along with concepts like contact and on the bit, the half-halt is a subject that is very confusing and mystical for many riders.
WHAT I LEARNED FROM LUKE
IS THE HALF-HALT ONLY FOR DRESSAGE?
WHY NOT OUTSIDE REIN IN TURNS
WHAT'S MISSING FROM THE GERMAN TRAINING SCALE?
The ideals of the GTS have a lot of merits and every horse in any discipline can greatly benefit from what it tries to teach. But without the underlying foundation of focus, clarity, and softness which underpin each element, it is nothing more than a series of mechanical exercises than has little benefit and bears little resemblance to good training.