Pro ... lifting weights usually makes you stronger ... did your friend have other problems that led to his heart attack? ..
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He had many of the afflictions that other musicians have: he was obese, smoked a lot and drank quiet a bit. That thing about lifting weights making you stronger usually applies to controlled repetitive exercise, not just slinging heavy speakers to shoulder height several times a week and carting keyboards to the car (that's likely all the exercise my freind ever got). I've seen people do far worse to themselves and live a lot longer so he may have been an exception, but I know for certain that he collapsed and died right after putting a pair of heavy speakers on their tripods.