I'd disagree that genetics are a huge part to play. They are when you're younger, but weight training and a good diet will ensure one'd reach the goal of a six pack (or at least visible abdominals).
With what I have underlined, is false. Some with genetic related complications will never see a defined ab core no matter what they do. I mean think about this some, its common sense.
Let us take a look at what Genetics is defined as:
In brief it basically means a discipline of biology, it is the science of heredity and variation in living organisms; living things inherit traits from their parents (and some from the grandparents and so forth). Genes correspond to regions within DNA, a molecule composed of a chain of four different types of nucleotides—the sequence of these nucleotides is the genetic information we tend to inherit.
Although genetics plays a large role in the
appearance and behavior of the living, it is the combination of genetics with what (in this case) a human being experiences that determines the ultimate outcome. For example, while genes play a role in determining an organism's size (etc), the nutrition and other conditions it experiences after inception also have a large effect. But doesn't change the base genetic foundation it improves/degrades from, it is built from or degraded from it.
In short the biological efficiencies/deficiencies (say with in the organs, tissue, etc), can play a integral part on the speed, improvement, and growth of a human being (not to leave out the possibilities of deficiencies in a program, i.e. rest. volume, intensity, etc, etc), having other effects as well.
For example, I have always had very large core muscles (that were once covered by fat tissue). With all the exercises I have done (over all), they have not grown much at all, but have in strength tremendously.
In contrast, my best friend, has very, very small and thin abdominal muscles, and works the core heavy like I do; they have not changed much. For him, his BF had to get lower than mine since they were smaller (not to mention his bodily structure is different). The difference between us, was 1 to 2 percent in order to begin to see the top two. And, 1 to 2 percent is rather significant IMO, when you define the additional loss in weeks/possibly months of dieting to get the last off. His core structure is genetic and so is mine. I have six he has eight.
If you do not think genetics play a huge role, open up your eyes some, and just take a look around you, just a tad more. It definitely does.
People are very quick to blame genetics when most of the time they're just not eating right, or are wasting their time doing cardio.
Some do
displace the blame for their troubles and complications for not reaching their goals, and this would be a large percentage, but not all of it.
Additionally, Cardio with the right person, definitely isn't a waste of time.
Peace,
Chillen