Jennifer (24) returns to StrongGirlz with her step-sister, Kate (21) in an all-new "mini-movie" that shows why big brothers shouldn't mess with their little sisters.The beautiful, athletic, and charismatic sisters don't appreciate their older step-brother suggesting that they cook for his friends that are coming over to watch the big game. After disparaging them one too many times, they challenge him to a workout, where the loser has to cook for the winner for a whole month. Big step-brother thinks it will be a walk in the park to out lift his "weak" sisters, but little does he know, they've b... Show more