Want to feel a little better about your Spring break margaritas indulgences? You've definitely got an extra 10 minutes to spare for a workout, and that's seriously all you need — 10 minutes! These ultraquick workouts can be done wherever your Spring travels take you — from the cabin floor to the hotel room to the beach. And don't even worry about packing equipment since none of these killer routines call for props or dumbbells (that's right, no excuses!).