I was a HIT guy for years, are you not picking up injuries?, I train with moderate everything and more sets these days, I still see HIT as optimal for me , I just got sick of missing months if training with tears and joint issues.
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I have always trained extremely hard but just to much volume and to often. I trained quads today and did just 3 working sets. I'm editing my video's and will post those 3 sets. When training HIT as when training period you must chose the most efficient exercise and that is not the squat nor the dead lift or the bent over barbell row or even the bench press.