It's not successful (for the Eagles) because of the size or strength of the Center.
Jason Kelce is one of the smallest centers in the league.
It works due to leverage. Look how low Kelce gets, in fact the entire offensive line gets so low, they get under the defense and use their legs to create push. Like a 6 man squat.
It also helps that Hurts can squat 600 pounds.
Our attempt in the Chargers game was embarrassing.
It looked like we practiced it 2 or 3 times and felt we had it.
I suppose the Eagles practice it often and have perfected it.
If we are going to do it (and we should), we need to practice it and perfect it.