Speaking of realism, there are about six basic body types: ectomorph, mesomorph, and endomorph, and a taller and shorter version for each.
An ectomorph isn't just someone skinny, they actually have a smaller bone structure. They can wrap their thumb and middle finger around their wrist and have them overlap.
A mesomorph is what the link was saying you want to look like. They have a larger bone structure than the ectomorph, and they tend to put on muscle more quickly. If they wrap their thumb and middle finger around their wrist, they only just touch.
An endomorph is the largest of the bone structures. They also gain fat more quickly. They can't wrap their thumb and middle finger around their wrist and make them touch.
So the uber defined V shape comes only with the mesomorphic body type. If that's not what you have, you'll never get it. There's nothing wrong with that. If you follow the link on the first post, there are pictures of people with other body types too. On the comparison of skinny guy vs. person in a binder, they were both ectomorphs- the skinny guy still had wider shoulders. On an endomorph, well, they tend to look like bears. Especially if they're hairy.
I think it's important to be realistic about your bone structure, however, it's always possible to exercise and bulk up the muscles to build up the line, however no amount of exercise will change you from a short ectomorph to a tall mesomorph, so you should be prepared for that. If that's what you're expecting, you're setting yourself up for failure.
But there's still a good reason to exercise. Even if you pass without it, wouldn't you like to be strong enough to climb out of a burning building?