"I'm obsessed!" Andrews said. 

She's not talking about the 49ers; she means New York City and Los Angeles barre studio Physique 57, known for tiny but highly efficient ballet-like movements that give dancer definition. Physique created this do-anywhere plan just for SELF; Andrews demos.

You'll Need: A set of 3-pound dumbbells. Those aren't wussy weights—we guarantee you'll firm with these exercises.

Your Plan: Do 2 sets of each move in any order four times a week.