Csonka often dragged defenders down the field as he picked up extra yardage for some historic Miami Dolphins teams in the 1970s.No opposing linebacker or cornerback ever welcomed a collision with Larry Csonka.John Randle went from an undersized, undrafted defensive tackle to a six-time All Pro selection and a member of the Hall of Fame.

He battled injuries throughout his career, but was one of the more rugged running backs in history.

After last playing for the Redskins in 1985, the bruising Riggins was named to the Pro Football Hall of Fame in 1992.

A college tailback and fullback, Csonka's bruising running style made him one of the most intimidating runners of his time.

At 6'3'', 235, he was rarely taken to the ground with initial contact.

The second member of the 1990s and early 2000s Tampa Bay Buccaneers to make the list, when Warren Sapp was in the prime of his career, there wasn't much that could stop him.

A beefy nose tackle with world-class strength and defensive-end agility and speed, Sapp for the majority of his career was unblockable.

After three consecutive Pro Bowl selections from 1975-1977, Conrad Dobler was named the "NFL's Dirtiest Player" by Sports Illustrated.

Now, whether you want to equate being a "dirty" player to being an intimidating one is your choice, but NFL'ers were undoubtedly afraid of Dobler during his 10-year stint as a professional.

Ball-hawking safeties who were always in the right position to lay a huge blow right under any opponent's chin.