The San Francisco 49ers linebackers were caught on video by Vine roughing up the blocking sled in training camp.
The San Francisco 49ers are taking part in training camp as they prepare for the 2014 season. Their fierce defense makes them a frontrunner to win the Super Bowl.
Their linebackers are the heart of their defense since they have Pro Bowl players in Patrick Willis, NaVorro Bowman and Aldon Smith.
The linebacking unit took part in drills with the blocking sled, and they showed no hesitation in pushing the machine.
Players such as Willis(52) and undrafted free agent Shayne Skov(44) can be seen roughing up the blocking sled in the Vine video below.