MODERN FAMILY - "Strangers on a Treadmill" - Claire and Mitchell enlist each other's help in trying to spare their significant others from embarrassment - Cameron from his unfortunate wardrobe choices, and Phil from his joke-ridden speech for the realtors' banquet. Meanwhile Jay tries to prove a point to Gloria by attending a quinceaera thrown by one of his employees, and Haley gives Alex sisterly advice on how to be cool, on "Modern Family," WEDNESDAY, OCTOBER 13 (9:00-9:31 p.m., ET), on the ABC Television Network. (ABC/KAREN NEAL) JULIE BOWEN, TY BURRELL, JESSE TYLER FERGUSON, ARIEL WINTER, ERIC STONESTREET