While Michelle Obama is excited about celebrating her 50th birthday on Jan. 17, the first lady is also using the occasion to look ahead and prepare her body for the changes the next 50 years will bring. 

"I'm seeing myself shift from weight-bearing stuff — even though that continues to be important — and the heavy cardio and running, to things like yoga that will keep me flexible," Obama told People. As a result, yoga will now be incorporated into her daily routine, an addition she says will pay off in better balance and flexibility "so that I'm not falling and breaking a hip one day."

Her goal as she embraces the half-century mark? "50 and fabulous," she declared.

As for food, Obama said she will continue to pursue the healthy eating habits that have served her well over the last several decades. "I don't obsess about what I eat, but I do make sure that I'm eating vegetables and fruit," she said. 

In an interview with HuffPo last year upon the release of her gardening book "American Grown," Obama revealed that she eats five small meals a day including a breakfast of stir-fried vegetables, tofu or oatmeal.

"And then I'll have a snack, something like this [pointing to a tray of sliced apples and honey from the White House beehive] or a vegetable tray or sometimes a protein shake ... then lunch," she adds. "This last year I've tried to change it so my lunch is my biggest meal ... like today, I had fish and vegetables, stir-fried vegetables. And if I'm going to have a carb, like a brown rice or a potato or something, I'll have it at lunch."

As for the birthday bash itself, rumor has it that Beyonce is scheduled to perform, though White House staffers are mum on the details. 

"There's one thing I can tell you for sure ... people will move," Valerie Jarrett, a senior White House adviser who is close to the Obamas, told The Associated Press.

Sounds like a party fit for the nation's most physical first lady. Happy birthday, Michelle!

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Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

Michelle Obama on healthy living at 50 and beyond
First lady describes how she plans to change up her fitness routine to reach her goal of '50 and fabulous.'