I think running outside is much harder than running on a treadmill...
They both give you a decent workout, but when you're outdoors, it seems like the impact of the sidewalk (or the road) makes it harder on your joints... I always get out of breath faster when running on concrete.
Going running on sand is also a lot harder than running on a treadmill. (Or it feels that way to
me!)
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Also, many people claim that treadmill running is boring and requires more mental stamina than that of road running.
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^I don't think so. I like going walking outside, but if I'm running, I would rather do it on a treadmill. It's easier to lose track of time when you're watching a good TV show or movie.
