I would ask your friend where he got his knowledge of that. Water is good for you, if you are thirsty you should drink some. You dont want to dehydrate yourself or your muslces. Many supplements are taken with water and some like creatine bring water into your muscles. As for after, water is just as important. Its important to take a protein shake immediately after working out, and those are taken with water.
But im no expert, so like i said, ask your friend where he got it. But ill say right now, it would take some pretty spectacular research to get me to say otherwise.
As for the cardio, it wont reduce your muscles. Its good for your heart and overall health.
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The Nintendo Wii:
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-Lifter101
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