Animated GIF · Available via API
gif_boxCable Concentration Extension (on Knee)
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fitness_center Equipment
CableCategory
strength
Mechanic
isolation
Cal/min
5.5
Force
push
Cable Concentration Extension (on Knee) is a intermediate single-joint isolation pushing exercise targeting the Triceps in the Upper Arms region. Performed using cable, it falls under the strength category. Secondary muscles engaged include Forearms.
list_alt Step-by-Step Instructions
Sit on a bench or chair with your knees bent and feet flat on the ground.
Hold the cable handle with your right hand and place your elbow on the inside of your right knee.
Extend your arm fully, keeping your elbow stationary and close to your knee.
Pause for a moment at the top, then slowly lower your arm back to the starting position.
Repeat for the desired number of repetitions, then switch sides.
warning Common Mistakes
Recruiting larger muscle groups to "help" move the weight instead of isolating Triceps — swinging momentum or shifting the torso takes tension off the muscle this exercise is meant to train.
Locking out too fast or letting the elbows drift outward under load — controlling the eccentric (lowering) phase is where most of the muscle-building stimulus happens.
Standing too close to or too far from the pulley, which changes the resistance curve and can take tension off the target muscle at the top or bottom of the rep.
Progressing the load or reps too quickly before technique is consistent across every rep of every set.
person Who Should Do This Exercise
Cable Concentration Extension (on Knee) is classified as a Intermediate strength exercise, so lifters with some training experience who already have basic technique and stability in place — beginners can work up to it, but should master fundamental Upper Arms movements first. It fits well in programs focused on strength training and pairs naturally with other Upper Arms movements in a balanced routine.
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