WEST LAFAYETTE, Ind. - The nation's aging, overweight population is fueling demand for personal trainers skilled at prodding the out-of-shape of all ages to get fit.
But there's no guarantee those buff trainers know the best workout for a 65-year-old man with heart disease or an obese woman in her 50s with diabetes.
Virtually anyone can become a certified trainer because there are no national educational standards for the field. Numerous Web sites offer personal trainer certification after just a few hours of online training - and a few hundred dollars.
That situation galls personal trainers like Ken Baldwin, who has seen people become disillusioned or injured by …
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