Lifting heavier weights

I have been lifting the traditional 3 sets of 10 forever now and have kind of gotten to a stand still... I read somewhere that you should lift heavier weights so I just changed to 4 sets of 6 and increased the weight and feel like its helping. Anyone have any information about this or experience?? I stumbled across an older before/after pictures post on here and everyone had amazing results, but nobody ever really said specifically what exercises they do in the gym?!

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