Even with all the rule changes of the past few years the NFL is still a league that lives by the law of hit them before they hit you. Bone-crushing hitters take that though to heart. They're the players who thrive on contact and letting opponents know that they're trespassing on dangerous turf. According to one study, bone-crushing hitters are also the leading cause of alligator arms among NFL receivers.There's nothing that fires up a team or makes a stadium erupt with noise like seeing one of these hitters making sure their opponent gets blow'd up real good! There are many who take pride in that accomplishment populating NFL sidelines today but these 10 are the best in the business.