I think Takeo Spikes is using (along with all the rest of the NFL). His neck is not human.
Takeo Spikes Official Website - Philadelphia Eagles Linebacker - Bio
Hi Mr. Spikes. I just wanted to congratulate you guys on improving to 8-8. I think next year you'll make playoffs. My question is I'm 15, just finished my freshman year of football, I was wondering what neck exercises you do to get your neck so freaky big? Go Bills!
By Mike Gagne From Pittsburgh, PA
"We have a neck machine that I work hard on."