Does making slow movement in a negative way in biceps workout make any difference? and any tips on making a lean body?

by saying negative movement i mean to say when we lift our hands up while doing any biceps excercise then when we put our hands down while doing this if we put pur hands down very slowly like in 3 seconds will it make a any difference?
Does making slow movement in a negative way in biceps workout make any difference? and any tips on making a lean body?
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