By far the most important thing is always to have RESPECT, DEFERENCE, and OBEDIENCE towards your husband, no matter what ... even if outwardly he doesn't seem to live up to it, just as one would have respect for a priest even if he's not measuring up to his state in life.
As for football, most leagues today are KEENLY aware of the potential for injury and concussions in particular. Probably within 5-10 years we'll have only touch football being played at the High School level. They're working on developing helmets to prevent concussions.
In the case of a disagreement, you can make your opinion heard, but you must still RESPECT your husband's decision and defer to it. Not just "keep silent" while stewing over it inside, but, as is the case with, say, the Magisterium, give a true internal assent. That true internal assent owed to the Magisterium is the same type of attitude that a wife must have to her husband, and not just outward lipservice. Once you develop that habit, feminism will very quickly be uprooted at the core. Of course, the limit is that if the husband were to command something immoral or contrary to the laws of God or contrary to justice, but even then, instead of losing respect, ask a priest to intervene and set him straight.
And, as Quid mentioned, NEVER EVER ridicule or poke fun of your husband. Women tend to get together in groups and deride their husbands as if they were idiots. Steer clear of the company of such women, and even object when the conversation turns in that direction. You see all kinds of TV programs and commercials where the husband is always the idiot and the buffoon who must be "set straight" by his wife. That's deliberate social engineering intended to upset the natural order created by God.