There are a number of differences between running on the treadmill and running outside:
* you get a small assist from the motion of the belt
* the incline on the treadmill generally stays at what you set it at, whereas outside running does involve some rises and falls, even on what appears to be generally level ground
* when running outside, you have to learn to pace yourself (ie. judge and manage your own speed). Treadmill running doesn't develop this skill.
* the treadmill is a softer surface with more 'give' than a concrete sidewalk - the impact can 'feel' harder on your body
* the treadmill is usually in an a/c'ed controlled environment. Running outside means dealing with climactic conditions. Running outside may involve more sweating, but that is what human bodies are designed to do - it is not gross (especially if you have a quick shower afterwards).
My advice would be to:
* slightly increase the incline of the treadmill (1-2% is generally reckoned to be the equivalent to running outside). This would address issues 1 and 2, although not 3 and 4.
* try to run outside whenever you can (at least once a week), and keep the treadmill for times when the weather is too unpleasant (both summer and winter)
* try and find some softer outside surfaces where possible (eg. trail running, on grass at a local park, your local HS may have a rubber track, etc)
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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