I felt like my scapula was being dug into the ground, with just the awrwardness of the movement I felt like I couldn't keep my back tight. Looking at the picture in the article right now I'm going to try it again with a slightly wider grip and lowering it to his abdomen not his chest.
Dude, definitely check out that glute article he wrote though, once you get up to the weighted glute bridge and stuff like that, your glutes get sore in different places. Good stuff.
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."