Cable Concentration Extension On Knee

Body Part: Arms

Muscle: Triceps

Equipment: Cable Machine

Cable Concentration Extension On Knee is a single-arm triceps extension performed with the upper arm braced near the knee. The cable handle provides steady resistance while the braced position limits body swing, helping isolate elbow extension and triceps work.

This exercise targets the triceps brachii, with the shoulder and core stabilizing the arm and torso. Because the upper arm is supported, the movement should feel focused and strict. The elbow bends and straightens while the shoulder position stays mostly fixed.

Set the cable at a low or suitable angle, take the handle in one hand, and position yourself so the working upper arm can rest or brace against the inner thigh or near the knee. Extend the elbow until the arm is straight, pause briefly, then return under control without letting the upper arm drift.

Use this movement as a triceps isolation accessory when you want a strict one-arm cable variation. Light to moderate loads are best. If the cable angle pulls the elbow into discomfort, adjust your body position, pulley height, or handle.

Instructions

• Attach a single handle to a low or suitable cable pulley.
• Sit, kneel, or crouch so your working upper arm can brace near your knee or inner thigh.
• Hold the handle with a firm grip and set your torso in a stable position.
• Keep the upper arm fixed against the leg as the elbow starts bent.
• Extend your elbow to move the handle until the arm is straight.
• Pause briefly and squeeze the triceps at full extension.
• Return the handle slowly until the elbow bends again.
• Complete the planned reps, then switch arms with the same setup.

Tips & Tricks

• Keep the upper arm braced so the triceps, not the shoulder, move the handle.
• Use light to moderate load because the strict position removes momentum.
• Do not twist or lean your torso to finish the extension.
• Control the return phase so the cable does not pull the elbow open.
• Choose a handle grip that keeps the wrist comfortable.
• Pause at full extension without snapping the elbow hard.
• Adjust your knee and torso position if the cable rubs or pulls awkwardly.
• Let the weaker side determine the load and rep quality.

Frequently Asked Questions

What muscles does Cable Concentration Extension On Knee target?

It mainly targets the triceps, with the shoulder and core helping stabilize.

Why brace on the knee?

The braced position limits momentum and helps isolate the triceps.

Should it be heavy?

No. Strict control and a clean elbow path matter more than heavy weight.

Where should my upper arm be?

Brace it near your knee or inner thigh so it stays still while the elbow extends.

Should my shoulder move?

No. Keep the shoulder and upper arm mostly fixed so the triceps do the work.

Can I do this with both arms?

This version is best one arm at a time because the braced setup is meant for concentration-style isolation.

What if my elbow feels irritated?

Lower the weight, change the cable height, or adjust your body angle until the line of pull feels smooth.

Why use a cable instead of a dumbbell?

The cable keeps tension on the triceps through the whole extension and return.