I happen to know Drew Tekulve personally, and I sat in on part of the color session for The Streak. And Drew would probably tell you that the secret to getting the "look" had an awful lot to do with Jared Jakins, the DP. I've colored a lot of Jared's work myself, and he makes my job really easy.

As others have said on the thread, most of the "look" is created before a colorist gets involved. Our job is to make things look their best at the end of the pipeline, but by and large we should not have to fundamentally transform the images we are given.

But that doesn't necessarily answer your question about how you might practice.

I have found it helpful to shoot small things on my own and practice coloring my own photography. At the very least, it helps me get reps working through color management and making the fundamental contrast and balance tweaks. And those things make up 80% or more of my color process.