1
Stand with feet shoulder-width apart, holding a barbell with an underhand (supinated) grip at arm's length. Arms should be fully extended at your sides with palms facing forward. Keep your torso upright and core engaged throughout the movement.
2
Grip the barbell with hands positioned slightly wider than shoulder-width apart. Ensure a firm underhand grip with thumbs wrapped around the bar. Maintain a neutral spine and slight bend in the knees. Keep elbows tucked close to the body at your sides.
3
Lower the barbell in a controlled manner by extending the elbows, allowing gravity to gradually lengthen the biceps muscles. Maintain the underhand grip position and keep elbows stationary at your sides. Continue lowering until arms are nearly fully extended but elbows remain slightly bent to protect the joint.
4
Flex the biceps and curl the barbell upward by bending at the elbows, raising the weight toward shoulder height. Keep elbows fixed at your sides throughout the movement. Squeeze the biceps at the top of the movement, then reverse the motion to return to the starting position in a controlled manner.