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1

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.


3

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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