Is a physique like Linford Christie's attainable naturally?
How do I go about it?
Yes. Unless you two are closely related your proportions will prolly not resemble his. But reaching a similar aesthetic is possible.
How do you go about it? By very carefully dieting + exercising. Should prolly mirror your training to imitate his (I'm sure he runs, sprints, lifts weight, etc.)
Since dude is not freak-level big or impossibly lean, this should be attainable natty. Now, depending on where you are now, it may take you quite a while (8-10 years or more).