Karen explained further on the articles comments. Very helpful:
"As for the “X” cue – if you visualize taking your right lat and putting it in your left back pant pocket and the left lat in the right back pocket… This would be the “X” that I am speaking of. This helps people engage the lats and remember to tense the glutes in order to move the body (descend and ascend) as one unit vs sagging and disconnecting."
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