Why it made the list: Decline-bench crunches amp up the challenge by increasing the range of motion over standard crunches, and you can dial up (or down) the degree of difficulty by adjusting the angle of the bench. Adding a medicine ball or weight plate against your chest adds a further level of customizable resistance. This also allows you to manipulate where you want to fail: low, medium, or high reps.
Genetically, women have a disadvantage when it comes to that. Their bodies store more fat than men. For good reason, says Calabrese. Women's bodies are designed to bear and nourish babies and fat is the primary energy source to support fetal development. In addition, Calabrese says, men generally lose weight quicker as a result of regular exercise.
After completing one to two minutes of the basic plank, you can move on to the side plank. The Side Plank is important for completing a full warm-up because it targets the lateral core stabilizers, including the obliques and transverse abdominis, but it can help improve the lateral stability of knee and hip joint as well. This is helpful for preventing and reducing knee pain in athletes who don't do a lot of lateral movements in their sports. For example, if you only run (forward), bike or do things like elliptical trainers, you will rarely work your lateral stabilizers. This exercise can help keep them strong and balanced.
Try adding four or five to the end of your workout to challenge your core a little more, or turn them into a standalone workout—try doing 12-15 reps of each exercise and then repeating the circuit (of four or five exercises) three to four times, to start. If you feel tension in your lower back during any of these exercises, stop and reset, making sure your abs are really engaged and that your back is not arched. You can also try starting with fewer reps. If you still feel discomfort, skip that exercise and try a different that allows you to keep your spine in a safer position. (It's also helpful to read up on which abs exercises tend to be irritating for lower-back issues beforehand if that's a concern for you.)
Getting ripped is more about your attitude and overall approach than it is about finding the perfect exercise or perfect food. Keep in mind, you're human and seeing any signs of abs are better than none. Don’t worry if you have a bad day at the gym or eating, you'll be fine as long as you get back on track the next day. For those just looking to trim down, this program still works by providing a beneficial guide for future cutting needs. 
"My goals six years ago was to 'get abs' and I used to think cardio and crunches would get me there. But it wasn’t until I started lifting weights and varying my abdominal exercises that I started to see a major change. You don’t realize how much you use your core muscles in order to perform powerful rapid movements like deadlifts!" — Shante Franca, @shantefranca
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