If he's inclined to swim, I would highly recommend that he look into doing that several times per week. He could pick up a "pull buoy" (a shaped foam flotation device that fits between his legs that would allow him to swim at a slower pace for a longer period) too. Although, as already mentioned, running uses more calories, but it is not the best idea to begin with a workout program with running because it taxes the body to much at first and will keep the heart rate too high to be effective as a fat burning exercise. Don't forget nutrition; 70-85% of weight loss comes from what you eat. He should check to see if his health insurance covers a visit to a nutritionist, it might be well worth his time, and then he could use moderate energy from vigorous walking, elliptical, swimming etc. to do the rest. I would advise him to shoot for a working heart rate of about 125-130 or so for good fat mobilization.
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"Religion is the one area of our discourse in which it is considered noble to pretend to be certain about things no human being could possibly be certain about"
--Sam Harris
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