Our expert says:
No, not needed. There are a couple of small differences between them but nothing like what you've heard. The main difference is the change in terrain, because you go up and down, and that means different muscles are used, but it's a small difference. And besides, you can get that by changing the gradient on the treadmill. The other differences are biomechanical, but they're so small it's not worth worrying about!
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