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The reasons are very... reasonable. The muscle heads are larger in the legs. I.e. the number of muscle fibers in each muscle head. Leg muscles carry far more weight on a daily basis. They carry whatever your arms are carrying. And then the weight of your entire body on top of that.


It could be something more complicated, but generally I'll just say that running hurts, especially when you're just starting or increasing your mileage. I would recommend following a training program like couch-to-5k. With something like that, the distance increase and schedule will be regulated. If you have excessive problems with pain or handling the ...

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