That's BS. Anyone can do it with the right diet and exercise combo.
You can debate with me as much as you'd like, but I've spent just a little time studying up on athletic training, which I have used to build my athletic training programs. To certain extents, individuals have different fast twitch and slow twitch muscles. Fast twitch muscles tend to be short duration and explosive efforts and the muscle tissue is bulky.
Slow twitch muscle fibers are less intense but long duration, which is why a track runner is built a lot different from a marathon runner. Slow twitch muscle tends to not be very bulky.
I've tried to bulk up with no real luck. At the same time, no weight lifter will ever be able to keep up with me in the hills. I wouldn't say I'm a natural whatsoever, but if I spent the same amount of time weight lifting as I did with long endurance, I wouldn't get a fraction of the results that I get with my current training regimen. I tailor my training so I can maximize my results in certain types of racing. Sure, I could try to improve my weaknesses, but I'm still winning the occasional race under my current strategy.
