“The Biggest Loser” (8 p.m., NBC): The torture continues on “The Biggest

“The Biggest Loser” (8 p.m., NBC): The torture continues on “The Biggest Loser” as the contestants are challenged to run a full 26.2-mile marathon. Next thing you know, they’ll be forced to watch 30 hours of NBC programming.

“90210” (9 p.m., The CW): On “90210,” the girls throw a bridal shower for Adrianna (Jessica Lowndes), while the guys have a bachelor party for Navid (Michael Steger) at a burlesque club. Guess who has more fun?

“Garage Mahal” (9:30 p.m., DIY): Your garage can double for a swanky game room or more in this new how-to-make-that-happen series.