Fastest way to get in shape for spring break?

fsugirl13
The title pretty much says it, but I really want to get in better shape. I'm 5'7" or 5'8" and I weigh about 120 lbs. I'm not trying to lose weight, I mainly just want to firm up and get some definition. I have nooo definition what so ever. Does anyone have any ideas? And if you have any idea, let me know about how long it will take. :)
Fastest way to get in shape for spring break?
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