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I heard from a friend that barbells work more efficiently than dumbells. He does workout but I didn't ask him how much and how long.
My personal tip, even though I don't workout strenuously, is to have your mind focus on your chest. If you don't think about it, your arms will naturally do most of the work. When you consciously think "move the weights up with chest strength" and pay attention to the feeling, you get more burn from the workout the next day.
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