I can't even remember which airlines or which flights asked each exit row passenger if they felt they could handle the rules, but many of the flights that I have been on do.( I only fly about 6-10 times a year) Not that they demand proof, but ask all in the exit row seats. . I am a 50 year ( not old or young) woman,5'4" and while I might have a harder time lifting 40 lbs. above my head, would have no problem performing any exit row duties. And I definitely have the ability to keep my head straight in an emergency. Instinct ( Maybe they should seat mothers and grandmothers in all exit seats ) Courtesy, also sometimes plays into this. If a women works to lift a bag, most will help before asked.( A good thing:-: )