Many people ask themselves how lean should they be. The ideal body fat percentage varies based on gender and on how active you are. For instance, the average body fat for a woman is between 25-31%, while for a man it is between 18-24%. On the other hand, the ideal body fat percentage for a woman who works out is between 24-21%, while for men it should be between 14-17%.  To get a clearly defined six pack, a man needs to get to under 10%.
"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
I absolutely despise the idea of a ketogenic diet because that’s something most of us can’t subscribe to for life. There are other popular diets besides keto like paleo and atkins that also demonize carbs and tell you that they make you fat. In my opinion, more food in general (which will invariably have more carbs) makes you fat, not carbs. Carbs are the basic fuel your body needs to function.
In your workout: Regularly implement both back and front squats into your program. To keep it from becoming mundane, you can rotate through them in four-week waves, or alternate weeks between back and fronts. It's best to do your focused ab training on a day after your heavy training days for the week. The last thing you want is residual soreness that forces you to decrease the weight on the bar.
Trainer tip: You know planks, right? It’s easy to go through the motions here. Don’t do it. “The key is to squeeze your entire body—quads, glutes, core, back, and fists—as tight as possible while taking diaphoretic breathes throughout the hold,” says Wealth. No matter how many times you’ve done it, this exercise is as difficult as you’re willing to make it. 

Warm up and cool down for 5 to 10 minutes. Go for a brisk walk or jog, do jumping jacks, run in place, or jump rope at the start of your workouts. Moderate aerobic exercise will increase blood flow to your muscles, which reduces your risk of injuring yourself. When you finish working out, cool down for 5 to 10 minutes to help your muscles recover.[11]
Evening Snacks (5.00PM) —1 scoop whey protein, 5 almonds, 3 walnuts. If it’s cardio day I mix a spoonful of peanut butter with my protein shake for some extra fat that satiates my hunger. I also keep a couple of reasonably priced Sugar Free Protein Bars in my bag in the rare cases when my hunger gets really bad or if I couldn’t manage a proper meal. There are some really expensive ones out there and while I’ve indulged in a few of them, the ones I linked to give me the best bang for buck and are also incredibly tasty.
There are thousands of trainers and infomercials hawking quick, effortless programs that are guaranteed to give users abs in mere minutes a day — as long as they buy an expensive piece of equipment or DVD set, of course. For some people with impeccable genetics or bulletproof diets, that might just be enough to make their core ripple with muscle. But most bodies just aren’t built that way.

When guys talk about six-packs, they are really talking about one muscle, called the rectus abdominis. “The rectus abdominis runs from our lower ribs down to the top of our pubic bone, and fibrous bands of tissue break up the muscle along the way to give us the six-pack look we all desire,” explains kinesiologist David Cary, C.P.T., a T4 Coach at Equinox in Chicago. So, if you want to sprout six-pack abs, this is the muscle you need to work.
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