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His arms show the effect. Kamil Bak, the 25-year-old fitness model living in Philadelphia, Pennsylvania, US (height: 5'11", weight: 159 lbs), hits the iron in two videos. In the first video he does standing biceps curls and hammer curls, in the second video Kamil demonstrates negatives at the bench press.
Video 1: Biceps curls
Video 2: Bench press
