Logic says that hopping on a treadmill is easier than running outside- no wind, the belt is moving, and so on. The other day I hopped on for a short workout and was suffering at 8 mph, 1% grade. On the other hand, I had no trouble averaging that pace on a tight 10 lap track despite jogging the turns.
Others have reported the same opinion that treadmill running feels more difficult. letsrun.com.
I like one comment at pponline.com
Running on a treadmill is easier since you don't have the wind resistance when you are running on road. Your muscles have to adjust though to the differences of the treadmill vs road running. A person running road for years and then jumping on a treadmill and finding it harder is a no brainer. The opposite could be said also. A person running only on a treadmill and then jumping on the road would find that harder.
Great discussion on the physics behind the question on the letsrun.com message board.
Treadmill is harder than running outside.It is my experience.
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