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hi all , i just started rununing 3 month ago , i feel like iam ont the top of the world, it is not easy but i love the challenge , the issue iam concerned about is breathing , i loose breath easily , i do not smoke , iam 36 female , iam 5 5 , and i weight 135 so iam 15 pounds overweight , the thing is i breath from my mouth , how to change that , and how to build up speed , ? how to deal the lactic acid pain ? thanks lov eyou all