Hi there. Great stuff in here, I appreciate you taking the time to share. My take could've been clearer. The majority of folks will associate the plank with a core-dominant exercise, but then fail to recognize how other joints and tissues can take over. This is not a bad thing at all, but rather just a more whole-body approach to the plank. The purpose of this post is to simply offer two adjustments if folks are looking to increase the work of core in this position.
There is an element of training for instability that should not go overlooked. Being in perfect alignment is not always the answer. I do love your comments about the compromised breathing patterns as this is something I failed to mention - I couldn't agree more. Thanks again for taking the time to share your perspectives.
Cheers!