Building up Cardio in 3 weeks... is it possible??

Well I'm gonna try! So nutcracker is insane this year. It's basically the same steps my dance teacher did when she was in core! (omwow....) I get winded easily! So, I'm going to start running everyday. On the eliptical or at the Galax track. :) wish me luck! i started today with 15 minutes straight.... wheew! Now let me tell you that running is NOT my thing. but it will be after 3 weeks! In a way this is kind of an experiment..... I'll definitely let you know how it goes :)