Muscles know no numbers, only stress. If you can make 50 pounds feel and stress like 100 pounds then it's just as good as 100 pounds according to the muscles. You're not wrong. The bottom line IS how much you stress the muscle. That can be acomplished ion many ways, not just heavy weights. Knock some weight off the bar, slow the rep speed down, and execute with perfect form and chances are that lighter weight will fell as heavy if not heavier than the heavier weight with a faster rep speed and more tendency to cheat. Bodybuilding isn't about being strong, it's about looking strong. If it's muscle hypertrophy you're training for then it's not how much weight you move, it's how much direct stress you place on a specific muscle. It's not about how much weight you move, it's about how you move that weight. No need to go through countless shoulder opperations and chronic tendonitis if you can get bigger without all that unneccessary damage. All you want to stress is the muscle anyway.
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