Why is it

So much eaiser to run on a treadmill, the outside?

I'm not sure if you were really wondering or not, but I will give you an answer.
On the ground you are pushing your body forward where as on the treadmill, the machine is doing the work for you, you don't have to go anymore. So you're actually working harder running outside because you are essentially propelling your body and you don't have to do that on a treadmill.

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Posted by KSquared

I'm not sure if you were really wondering or not, but I will give you an answer.
On the ground you are pushing your body forward where as on the treadmill, the machine is doing the work for you, you don't have to go anymore. So you're actually working harder running outside because you are essentially propelling your body and you don't have to do that on a treadmill.

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wow - thanks !