I like to start this routine with abs and finish up with cardio. I like to start with decline bench sit ups. This is a very simple exercise to do but its very effective if you do them consistently. I do 4 sets of 25 reps for these. Next I like to do hanging leg raises. I hang from a pullup bar and raise my knees to my chest. Be sure to squeeze the abs on every rep and try not to use to much momentum. I do 4 sets of 15-20 reps for these. From there I like to do in-outs on a flat bench. Plant your butt at the edge of the bench and plant your hands firmly on both sides close to your body. Lean back and bring you knees into your chest. Same here. Dont use too much momentum and be sure to sqeeze the abs on each rep. I do 4 sets of 25 reps for these. From there I like to do side leg raises on the floor for my obliques. Simple exercise but very effective for tearing those obliques apart. I do 4 sets of 25 reps per side. From there I like to finish up with russian twists on a decline bench. Twist your torso back and forth and touch your opposite elbow to your opposite knee and use a 1-1 count all the way to 25 reps per side. 4 sets of these. You can intensify this exercise by leaning back further and holding a light dumbbell in between both hands. From there I start cardio. I usually hop on the treadmill and jog at a moderate pace (6.0) MPH for 15-20 minutes. I do this routine up to 4 times a week when I'm on my cutting cycle. If you want to burn fat and get shredded abs then this is the type of routine you should be doing 3-4 times a week.