Dr David Haslam, of the National Obesity Forum, questioned whether it was realistic to expect people to do two weight training sessions each week.
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Williams, the Arizona tackle, said that much of the weight loss has to do with new training methods in which a player can be a lot smaller without losing strength.
WSJ: NFL Players: Tired of Being Fat
"That was a big switch physically, I had to try and do most of that in muscle so I got into a lot of weight training and fitness training, " he said.
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