‘“Just physically, it’s tough,” said Ertz, who was drafted 35th overall by Philadelphia in 2013. “You’re used to blocking people that are maybe going on to be lawyers or high school teachers. These guys are grown men who could be 30 years old and you’re 22 or 23 years old. So when I came into the NFL, I could run routes. I could catch the ball. But we were a run-first offense. It took a little bit for me to acclimate to the demands of the position for the Eagles at the time.”’