Our expert says:
If you set the treadmill at a gradient of 1%, the general consensus is that it's the same as running on the road. Some people find it more difficult, others easier. So it's probably more to do with preference than it is to do with the actual challenge. I do think the danger with treadmill running is the repetitiveness of it - I think that the same landing and loading step after step probably increases injury risk and running outdoors provides variety that may help with injury risk. However, that's something that is separate from the actual challenge, once again. I'd say that if your'e getting fitter, then keep going, but consider ways to add some variety, because in the long term, that will be a big help!
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