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“A lot of the arguments right now are people are taught from Pee Wee football that this is how you play,” Mack said Thursday. “Well, we need to change that. You can’t be breaking your head. There are better ways to tackle. We’re taught you’re not supposed to spear with the top of your head.”

On Wednesday, Goodell sent a memo and video to all teams explaining the reasons for the increase in penalties against offenders. He said players are expected to play within the rules, and that coaches and teams will also be subject to penalties.

Several players said they were confused about the changes, with some on the defenders’ side saying they were being unfairly targeted.

“Unfortunately, defensive players look like the bad guys in this,” Browns linebacker Scott Fujita said. “But there’s a lot of guys on those offensive lines who are dirty, too.”

Mack said it will be difficult for many coaches and players to change their ways after years of conditioning. However, in light of medical studies linking head injuries to long-term medical conditions like dementia, Mack, who hopes to play 10 years in the league, understands the urgency.

“When you’re taught a certain way, you’re going to keep doing it,” Mack said. “It needs to change, though. I saw that ‘Real Sports’ show with the connection between Lou Gehrig’s Disease and concussions. That is scary. I was watching and thinking, ‘Why am I playing this game when I could be physically handicapped for the rest of my life.

“It’s a scary thing. It’s good to see there’s some progress to try and protect people.”