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Do arm bending exercises with dumbbells, two methods, which exercises muscles to grow fast?
1, fast movement of crank arm: light weight, many times, the purpose is to carve muscle shape.

2, the crank arm moves slowly: it adopts large weight and grouping to increase muscle circumference.

Generally, large weights are used first, and then small weights are used to carve muscle types after group sports and when muscles are fully swollen.