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How do you get Americans to pay attention to a healthy-living initiative for kids four years after it鈥檚 launched?

Take it to New York City, and join Jimmy Fallon and Will Ferrell 鈥� both in drag as teenage girls 鈥� on a basement couch, a la 鈥淲ayne鈥檚 World,鈥� and pull out the kale chips. That鈥檚 what first lady Michelle Obama did Thursday night on NBC鈥檚 鈥�Tonight Show,鈥� demonstrating her comedy chops in a

Mrs. Obama played herself, and that meant promoting fitness, saying 鈥渆w鈥� to jelly doughnuts, and getting up off the couch for an 鈥� 鈥楨w鈥� dance party.鈥� It wasn鈥檛 聽鈥� perhaps the most eye-popping TV performance ever by a first lady 鈥� but Mrs. Obama showed, once again, that she can move.

And that was the point. Her Let鈥檚 Move! campaign, four years old this month, is Mrs. Obama鈥檚 main initiative as first lady, and Fallon has become a regular stop on her circuit. Two years ago, she competed with the comedian in feats of strength at the White House 鈥� push-ups, dodgeball, a potato sack race 鈥� for the second anniversary of 鈥淟et鈥檚 Move!," back when he was host of 鈥淟ate Night with Jimmy Fallon.鈥� Last February, it was mom dancing.

This year, the fourth anniversary coincided with Fallon鈥檚 debut as host of 鈥淭he Tonight Show,鈥� a week packed with A-list guests. After the 鈥淓w!鈥� sketch, she joined Fallon on the regular interview couch for some conversation about her girls, who we鈥檙e guessing may have taught her a bit about things that are 鈥渆w.鈥�

Now 15 and 12, Malia and Sasha Obama aren鈥檛 as into hanging out with their parents as they used to be.

鈥淭hey want nothing to do with us,鈥� the first lady said. 鈥淚 am so serious.鈥�

Mrs. Obama also warned the people of Washington, D.C., that Malia is getting close to one of the dreaded (to parents) milestones of adolescence: learning to drive.

After the Obamas leave Washington in a few years, the girls 鈥渉ave got to be able to function as normal people, and driving is a part of that,鈥� she said. 鈥淟adies and gentlemen of D.C., watch out!鈥�

Mrs. Obama also made a push for enrollment in health insurance, and came up with a new term for 鈥測oung invincibles,鈥� the 20-somethings who don鈥檛 think they need coverage: 鈥渒nuckleheads.鈥�

鈥淭hey鈥檙e the ones cooking for the first time and slicing their fingers,鈥� she said. And 鈥渄ancing on the barstools.鈥�

While in New York, Mrs. Obama promoted another of her healthy-living initiatives, the Drink Up campaign, which encourages drinking water. She visited the New Museum in Manhattan, which has an exhibit of street art that encourages people to drink more water. She also appeared at a private fundraiser, reportedly at the home of Obama 鈥渂undler鈥� Maneesh Goyal.