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The benefits of cross training are well known to runners, and here's one more to consider: Walking on a treadmill at a 12-15% incline.
According to a recent Active.com post by Matt Fitzgerald, there's research to show that walking on a treadmill at a 12-15% incline is roughly equivalent to running (on a flat surface, presumably).
So if you are recovering from injury and working back to running, take heart, and maybe give the inclined treadmill a try. Or if bad winter weather keeps you from a run, this may be just what the doctor ordered.