NFL lineman weren't always so enormous - see how much they've grown over the years

In the NFL, quarterbacks are bigger than ever. How big? At 6-foot-5 and 250 pounds, Cam Newton is bigger than most offensive linemen in the 1960s.

Of course, nowadays, offensive linemen are much bigger than that. The average guard, tackle, or center in the NFL in 2015 is 6-foot-5, 312 pounds.

Of the 159 players who have started at least four games as an offensive lineman since the start of the 2014 season, only 23 weigh less than 300 pounds and 39 weigh at least 320 pounds.

To put the sizes in perspective, let's compare the average size for an offensive lineman through the years to an active player.