cardio that will get you "shredded" should always be intense (of course, diet plays a huge part as well)
try this cardio workout on a off day
it is my new circuit called "the statue of david" workout
do this circuit only one time around
Body of David workout
Clean Squat Press x 30
Kettlebell swing x 30
Kettlebell Clean Press x15+15 (15 each arm)
Plyometric box jump x 30
Chirpee x 30
One Armed Barbell Power Snatch x 15+15 (15 each arm)
Dumbell Thruster x30
Medicine ball Jumping squat x 30
Tire Flip 200m's (back and forth hallway)
Burpee jump onto tire x 30 (see youtube clip below)