I've just bought a treadmill to use over the winter on the days when it's too snowy/icy/dark to go outside.
Before this I've only run outside and the treadmill feels a little odd.
Is there any 'difference' between indoor and outdoor KMs? Is it 'easier' to run on a treadmill? I plan on using some of the gradient features (I hate hills outdoors so this will be good training), but am wondering if my outdoors performance will drop when I get back outside in the spring?