I think some body types might take to running more naturally, but that's probably true of any sport. Some of us are born with it, some of us have to learn it, and some of us aren't physically capable for one reason or another. Generally, most of us are capable of doing it, it's a matter of natural skill combined with education, will, (in)sanity, and time.

I don't think my body type was built to take to running as well as other body types, but I had to stop using that as an excuse and come to terms with the fact that it's just harder for me to become a (faster) runner (have trouble calling myself "a runner"). It's going to be hard, and in the end that may just make it more rewarding. Some people find other kinds of challenges more rewarding. When you factor in body type, personality, and other environmental factors, running really probably isn't for everyone, whether they are capable of it or not.

And it takes all types to make this find world of ours turn.