Paywalled, but: https://theathletic.com/2755968/2021/08/09/cox-is-heading-absolutely-necessary-to-the-game-of-football/ https://theathletic.com/2755968/2021/08/

Paywalled, but: https://theathletic.com/2755968/2021/08/09/cox-is-heading-absolutely-necessary-to-the-game-of-football/ https://theathletic.com/2755968/2021/08/09/cox-is-heading-ab... The main suggestion is that heading could be banned outside the 2 penalty boxes.