As an offensive lineman I played in the one position group that every play involved making contact with an individual from the opposing team therefore the practice module for my position group has always been unlike any other during the daily practice periods. Contact contact contact was the name of the game. One of the main ways for my line mates and I to simulate game situations, to practice the correct hand placement, to practice proper fits and to practice proper footwork was the use of the blocking sled. In addition to using the blocking sled EVERYDAY (which in most cases was deemed to be a safe way to avoid injury) we would also use hand held pads to simulate defensive players to be blocked in the variety of plays that were called and the schemes we would face daily.
I can't count how many times I have hit the sled and gotten my bell rung. As opposed to hitting a moving target i.e... an opposing player where the allocation of weight is distributed based upon the angles of said defender when contact is made; with a sled this is stand still dead weight (it should be noted that sleds are often stacked with additional weight to increase an inability to be easily moved) that often results in a jarring event occurring.
As much as we continue to develop safety measures to improve,sustain and save the game of football we must recognize the importance and need for an ongoing prolonged excogitation for repairing what has become long term systemic cognitive impairment. It starts with young organizations and youth football. Along with teaching the appropriate method of blocking and tackling we must recognize that this process although effective is not 100% devoid of head contact occurring. This method will assist along with the improvement of head gear modification in making the game and its long term affects on its participants safer.
We can't determine when and exactly how anyone gets concussed but if we can find ways to decrease the likelihood we are justifying the continuation of this game that I so love.