When working out, most of us lift weights and strength train in our running shoes; I know I do. But running shoes are technically made for running — just front to back motion. Strength training happens in all three planes of motion: front to back, side to side, and rotation. And our running shoes just don't support that variety of motion. While shoes specific for "training" seem a little excessive, like a marketing ploy, I see Nike's point.
What I want to know is . . .