NBC’s hottest series this fall is the weight-loss reality series “The Biggest Loser,” and on Tuesday’s episode the nine remaining contestants head to Washington, D.C., for a two-hour adventure that will take them from the steps of the Lincoln Memorial to the White House kitchen garden.

Competing as individuals rather than in teams, their first challenge is to race around the National Mall and bring as many people as possible back to the Washington Monument for a public workout with trainers Bob Harper and Jillian Michaels.

While in D.C., the trainers and contestants also meet with Sen. Kirsten Gillibrand (New York) and Senator Robert Casey (Pennsylvania) to talk about the need for better health and nutrition education, especially for children.

Then the players engage in a wild four-part competition involving D.C. landmarks and visit to the White House. There, along with assistant White House chef Sam Kass, they pick vegetables from the White House kitchen garden and head inside to join White House executive chef Cristeta Comerford in preparing a healthy and delicious salad.

At week’s end, the contestants weigh in by the steps of the Lincoln Memorial before another elimination round sends a contestant home for an emotional reunion with his or her family.