Physically, treadmill running is a bit easier than running outside. The major factors are wind resistance, varying terrain/elevation, and temperature/weather differences.
This study showed that running on a treadmill with a 1% incline tends to approximate outdoor times at most common running speeds.
Mentally, which one is easier depends on the person. I personally find my times on a treadmill are far better because the treadmill makes pacing
much easier. I set the speed for the exact workout I want and can basically disable my brain. Running outside, I constantly have to make sure I'm not going too fast or slow, which gets tougher and tougher as I fatigue. Some people find treadmills incredibly boring and mentally do much better with the changing scenery of the outdoors.
I disagree. I run outside, and refuse to run treadmill unless I have no other choice (too cold, too much snow, too hot, etc). I get bored by mile 3 and then the rest is just doing it to do it, instead of doing it because I enjoy it.
You enjoy turning off your brain and going on auto-pilot, and there is nothing wrong with that if it's what you enjoy and works for you. For me though, running outdoors keeps my mind active and stimulated. Before I know it I'm 1/4 of the way done with the run, then 1/2, and it's over without really going through any times of dreary "this is exactly like the last mile, and 5 miles before that."
Also, as I have run more I have learned to regulate my pace much better. I have found that I am able to estimate my pace fairly accurately, if not 100%. I don't want 100% accuracy though, I want to go with what feels right and have stopped caring as much about time. I have found much more enjoyment out of running this way.
Just isn't the same. I hate jogging on the treadmill. Almost a waste of time except the calories burned. Jogging outdoors is the only way to go. I go when it's hot or cold. About 100f and 32f are my limits though. Any hotter or colder and I'll use the treadmill.
I have to agree here. I really wish I lived in San Francisco or something where it's ~70 and sunny almost every day.
kamper said:
Personally, I find the opposite, to some degree. While having a treadmill set a pace is nice, it's too rigid. If I accidentally drift a little faster or a little slower, I find having to immediately correct (over-correct actually, to get back to the middle of the treadmill and then correct again to stay there) is awkward. It would be easier, I'm sure, if treadmills were twice as long.
With constant feedback from a watch, it's not too hard to consistently stay within perhaps a 20 second/mile pace range outdoors, barring any significant elevation irregularities.
Another thing about treadmills, although it probably only applies to heel strikers on cheap treadmills, is that a little bit of forward pressure when landing will cause the tread to jump a bit, which feels very awkward. Ground doesn't give way like that.
I agree here too. On a treadmill, I find that I am much less focused on my running/body and paying more attention to the treadmill.
Even without constant watch feedback (I don't run with a watch, but use runkeeper on my phone which I don't check often), you can stay within your pace fairly well once you have run enough. Also, if you find a set loop from your front door (for example I have a 6.25 mile loop from my house>my house), you can guage your run very easily. Obviously the problem with this is that you might be learning the course instead of your body, but if you switch it up (maybe run opposite direction) then you can avoid this.
IMHO treadmills are useful in these situations:
-regular barefoot runs
-if it's too hot (90+ with high humidity for example)
-if it's too cold
-other weather conditions (snow, hail, thunderstorms, etc)
-starting a weight loss program or starting running
-you want to avoid the increase stresses from outdoors running
Outside of those situations, there are very few reasons to do treadmill running IMO. To each their own though, and I'll admit that I have thought about picking up a treadmill lately for myself.
Also, as a side note. If you run outdoors, you get a much more varied workout with every step. Maybe you hit a cool patch of air, the ground might be different, different sounds/noises, etc. It makes me feel much more in touch with nature and my core body/psyche. I don't feel treadmills allow me to let go of the daily stresses as easily.