We discussed the crest flip at dressage camp, and last week the following video came up on my social media.
Now, camp seems a long time ago, but I'll endeavour to remember what we discussed.
The horse I was riding finds it difficult to connect through his body, back to front, and where he "cheats" and just holds his neck, he had developed an enlarged muscle one third of the way down his neck – where the trapezius inserts. We worked on releasing this knot of muscle by getting him to flex his head and neck, so releasing the muscles in his jaw and neck.
From above, I could see that an inch section of his mane insisted on falling left, which was where the tension was held.
When I managed to release those muscles, I was rewarded with that inch of mane flipping over to the right, to join the rest of his mane.
I had never heard of the Crest Flip before, but I've been keeping my eyes peeled for it on other horses.