Although this drill was associated with relatively few head impacts (compared with other drills), the impacts tended to be of high magnitude. (sciencedaily.com)
There are plenty of other drills to improve breathing and 360 degree muscle activation of your core, but those will have to be addressed in another post. (weckmethod.com)
Despite training a certain exercise only once per week, you can experiment with adding other drills from the same category on separate days. (roughstrength.com)