+ For a total body cardio workout
If you can't run long distances like me (it's so hard on my knees!), I highly suggest trying this interval workout. The changing incline and speed is so good for you.
The side plank is a killer but works wonders! I've also been moving my legs in and out (first image) while planking and it's amazing how much it works your abs.
As far as legs go, I don't really do anything besides cardio and the occasional lunges. The stair stepper is perhaps the most painful but effective machine because it really slims down and defines your legs. Walking or running on a high incline works well too!
Are you amping up your workouts at all before spring break?