4. muscle in front of the arm and gradually reduce the Dumbells slowly down until it returns to the default port.5. repeat with 12-15 times per set and all 3-4 g:H9.
4. Muscle contraction front arms, and gradually lower the dumbbell slowly down to return to starting position 5. Repeat by 12-15 per set, and do all 3-4 g: H9 .