It's pretty tough for me to rock in FL/PE4. I can start the rock if I put my hands overhead (like in the next PEs), but I don't get a very large rock, meaning the ROM is smaller than the athlete's in the video. I have good PPT, but at times it feels that my glutes get in the way during the portion of the rock when my feet are closer to the ground. I'm guessing the secret to fixing it would be to get my lower back pressed onto the floor on both portions of the rock, but that just isn't happening right now.
Any ideas?