I'd say this is not true. The doctor from the movie "Concussion" said that Rugby, most martial arts, and lacrosse are all sports that need massive modification

I'd say this is not true. The doctor from the movie "Concussion" said that Rugby, most martial arts, and lacrosse are all sports that need massive modification for those under 18. Adults can make their own decisions, he said, but these sports are demonstrably bad for brain-safety.