Performing the: A Step-by-Step Tutorial Cable Seated One Arm Concentration Curl
Sit on a bench facing the machine, grab the handle with one hand and place your elbow on the inside of your knee of the same side.
Keeping your back straight and your arm perpendicular to the ground, slowly curl the handle towards your shoulder while keeping your upper arm stationary.
Hold the contraction for a moment at the top of the movement, then slowly lower the handle back to the starting position.
Repeat the motion for the desired number of repetitions, then switch to the other arm.