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An arm curl machine is a piece of exercise equipment designed to target and strengthen the muscles in the upper arm, specifically the biceps. It typically consists of a seat with a pad for the back, a padded armrest, and a handlebar or barbell attachment. The user sits on the seat, places their arms on the armrest, and grips the handlebar or barbell. They then curl their arms up towards their chest, contracting the biceps muscles, and then lower the weight back down to the starting position. Arm curl machines are commonly found in gyms and fitness centers.