I've been trying to increase my pace with running. Lots of treadmill tempo runs this week. I think that's why I love the treadmill going back to the discussion a while ago. When you are road running you obviously have challenges like inclines, but a treadmill, you set the speed and you have to physically adjust it to lower it. Outside you can slow down, sometimes without probably knowing but a treadmill, it's that mindset to try and go a distance while maintaining or increasing speed.
I do find it for reason harder running distances in shorter times on a treadmill, just seems harder. Last two days, did a 3km at 15 minutes and then last night a 4km in 20:47. Clocking a 5 minute per km speed is so difficult personally.