Does anyone know why running on a treadmill is so much harder than running on the street? Outside, I typically run an 8:15 mile comfortably. Running on the treadmill, I can barely run a 10:30 pace. If I jack up the speed to a 9 minute pace, I am try heaving. I assume it has something to do with different muscles being engaged, but why, I wonder? Anyone else experience this?
I am sure my treadmill is calabrated properly because it is brand new and the distance syncs up perfectly with the fitness app on my ipod for tracking the distance.