Unpolished due to stiff tailz... well, so's the hood. I was focusing more on the actual run animation so I can get used to the standard keyframing habits most people do when animating, which is making actual keyframes before making inbetweens. I was able to mirror the later half of the loop thanks to the Paste Opposite tool.

Gotta say, it feels weird. It's like taking steps, jumping back, and then do it again with half-steps. But I guess I can see why it's an animating standard, because it took up about 30%-40% less of my time compared to when I make other animations. Less hassle and easier to improve on, too.