Also want to add to the point above that if someone like Gwynn is not an avid weightlifter ands takes PED, it does not mean he isn't doing resistance training. Swinging a bat is resistance training. Running is resistance training. Of course calisthenics are too. They may not make your body explode in muscle mass like a more efficient weight training program, but they are going to make your muscles increase their capabilities at what they are doing.
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