Keeping things neutral is the current buzz, as some olympic lifters look to the horizon while some look feet away. Currently no threshold has been documented in terms of injury (acute or chronic) , as many athletes such of offensive lineman get into neck extension for thousands of snaps in an NFL career. Charlie Weingroff posted what I thought was an important post on Packing the Neck. Keeping the neck aligned is vital during the acceleration phase of sprinting, and a good question is how much extension (if any) is acceptable when lifting weights? I am all for training safely but solid numbers is so important when trying to reach common ground. Many use extension to help get out of kyphosis to spare the low back, and I hope more people talk about packing the neck more as it relates to coaching.