Question: How effective an exercise is swimming for 30 minutes a day? 

Answer: Very.  Swimming is great cadio, and its almost NO impact, meaning that it doesnt hurt your knees, ankles, hips, etc...Shoulders take a bit, but every sport works something out.  \nAlot of athletic types who have joint surgry are made to swim as \nrehab.  \nTake a deep breath and go to it!
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