Lay flat on your back again for this one but this time, place a dumbbell between your feet with your knees completely bent and thighs pointing straight up. Hold on to the dumbbell with your feet and bring your legs up toward your chest making sure your lower back gets off the ground. Focus on using your abs to pull your legs up and not getting momentum from your knees or feet. 

Let's come clean from the start: We're not here to sell you on the single "best ab exercise ever." Too many organizations and authors have tried that, and the profusion of "winners" out there can make it confusing—especially because the studies backing them are always limited in one way or another. A few years ago, it was the bicycle crunch. Then it was the traditional crunch. Then it was the pike, the plank, the roll-out... We could go on.
Body Recomposition — This essentially refers to losing body fat and building muscle at the same time. Now, conventional wisdom dictates that you cannot do both at the same time . This however, is not entirely true. You can lose fat and build muscle at the same time if you are in a positive nitrogen balance (I just take this to be sufficient protein intake) OR you’ve never trained with weights before. When you first start lifting, your body is not used to the amount of wear and tear (shock) resistance training causes to your muscles. Because of this, your body amps up it’s testosterone (muscle building hormone) production to make sure it can keep up, resulting in some awesome newbie gains. These are highly accelerated periods of muscle growth right after you start training. It’s often said that the muscle you gain during your first 1–2 years of training is more than all of the muscle you can pack on in subsequent years combined. Seeing these quick gains is great as it’s extremely satisfying and motivating as a newbie.
Instead, we've put together a full slate of top-level choices in no particular order, along with some explanation about what make each one great and the research backing them up, when available. When building this list, we considered bodyweight and loaded exercises, EMG studies, anti-rotation movements, and much more so that no ab exercise was left behind. That said, it's time to meet the crème de la crème of the core!

"This exercise is so effective because it teaches you not to rely on your bigger muscle groups (like your thighs) and focuses on using your abdominals correctly in a controlled manner without using momentum. The use of the ball gives you natural feedback of your weaker side so that you can adjust and work on symmetry of your musculature, preventing future injuries."
After having achieved this goal, there’s a seemingly big void in my life. I intend to fill it up with another ambitious goal instead of more training, though the latter is far more tempting! I find that training, staying fit, and eating right fits in very well with my lifestyle. I intend to keep it that way while being content with slow but lean and steady gains over time. I do intend on dabbling in boxing and advanced callisthenics in the future.
Health fats is another valuable source in order to get lean muscles such as fish oils, raw nuts, olive oils and nut butters into your eating routine. These sources will keep your insulin levels stable, which is very salient if you will likely lose stomach fat and uncover well defined abs. I am not saying to go out there and eat a whole sack of Planters Cashews.

"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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