Moreover , base runners should also not run with their heads first so as not to get into a head on collisions with one another and incur serious head injuries .
This is made possible by use of helmets for both batters and catchers .
Base runners should also not run with their heads first so as not to get into a head on collisions with one another and incur serious head injuries .
This is made possible by use of helmets for both batters and catchers .