What are the different treadmill apps worth looking at? I heard Eddie Izzard on the radio this evening and he was running on a treadmill using Zwift and I quite like the sound of it. How do they work? Is basically like playing a running video game where you're running along streets, through the country, etc virtually? I've seen some treadmills mention Kinomap and NordicTrack have ifit - are they all a similar sort of thing?
And do you need a treadmill that's supports them, or do can you use them with something like a Fitbit?