Funny thing about sweat - when I was boozin' and smokin', my sweat smelled, well, like sweat. Since quitting both and improving my diet (can't help it, really), my sweat has no odor. It's awesome.
But dropping weight for me is achieved the quickest not by sweating, but by laying off the white starches. Pizza, bread, pasta, tortillas. Since cutting back about 90% on consumption of these items, my weight drops like a stone.
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Two wheels good. Four wheels bad.