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Perhaps - I'll have to try incline again now that I have have The Watch for my workouts. I stopped using incline years ago as it really didn't do much for me compared to running up a real hill, and then my trainer explained why. It made sense once I thought about it. Another factor that makes a treadmill easier than outdoor running include lack of drag from moving through the air (let alone a headwind on a blustery day).

While I do use treadmills for a number of reasons as an adjunct to my outdoor running and hiking, I keep in mind it's a little less "work" overall, and too much of it in place of outdoor running affects my adaptation for the latter.

Another exercise machine I found lacking was the "rowing" on my home Bowflex gym. While it is a satisfactory machine for strength training at home, the rowing aspect never made sense to me. It would barely raise my pulse. Then I realized the only energy consumed is in the inefficiency of my own muscles and movements. A real rower (or stationary bike) dumps your motion into some kind of device ("sink") that wastes it as heat, such as a friction belt, fan, or water chamber, never to return back to you. The Bowflex and systems like it return the energy back to you like a spring (or gravity, in the case of lifting a weight up and down).

im a bodybuilder and use cardio as a tool. If i could not do any cardio i would love it as i don't really like much cardio. I noticed this years ago. i can do normal hiit training on a treadmill running at 10-11mph for 20 seconds will raise my heart rate to 150(after working out).
If i have the treadmill on an incline of 6-8 i only need to do 6mph to get it up to 150(after 20 seconds) and it stays there longer bringing it back down to my normal 3.8 walking speed when i do intervals.
I wouldn't say one is easier than another running outside takes a toll on my knees. depends on the level you are doing on a treadmill and outside running to really figure one as being "easier".
 
Good idea. When I was in Phoenix, I had to get out and run/walk at 4:30AM to beat the summer heat, or go to the gym later in the day.

Most important is we all get out and move. We hear all kinds of things for making and keeping us healthy but the one common denominator is activity!
 
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