Suppose I use a treadmill set to 3 mph, with an incline of 15 degrees for 10 minutes.
I then go to a 15 degree hill and walk for 10 minutes at 3 mph.
Are the two scenarios above roughly equivalent in terms of exercise and energy expended?
What I'm really wondering is, if the ascent (i.e. the height I have to lift my body weight) on the treadmill is the same as on the road. It's supposed to be, but is it really ?