Cable Seated Floor One-Arm Concentration Curl

Body Part: Upper Arms

Muscle: Biceps

Equipment: Cable Machine

Cable Seated Floor One-Arm Concentration Curl is a single-arm cable curl done from the floor with the upper arm braced against the inside of the thigh. That floor setup takes away a lot of momentum and makes the curl feel more isolated than a standing version, while the low cable keeps tension on the arm through most of the rep.

It is primarily a biceps exercise, with the brachialis and brachioradialis helping to finish the elbow flexion. Because the elbow stays pinned in place, the movement is useful for lifters who want cleaner arm work, a better squeeze at the top, and a setup that makes cheating with the torso much harder.

The position matters here. Sit close enough to the low pulley that the handle can travel smoothly without the shoulder being dragged forward, then brace the back of the upper arm against the inside of the raised thigh. Keep the wrist stacked over the forearm, the shoulder relaxed, and the chest tall so the curl starts from the elbow instead of from a shrug or torso twist.

Drive the handle up in a smooth arc toward the front of the shoulder, squeeze the biceps briefly, and lower it under control until the arm is nearly straight again. The cable should stay under tension the whole time, so a lighter load is usually better than trying to force a heavy dumbbell-style curl. It fits well on arm days, accessory blocks, and higher-rep hypertrophy work, but it is still worth stopping the set if the elbow slips off the thigh, the wrist bends back, or the torso starts rotating toward the stack.

Use Cable Seated Floor One-Arm Concentration Curl when you want a strict isolation curl that is easy to feel and hard to cheat. The floor position makes it especially useful for building a strong mind-muscle connection, finishing biceps work after heavier compound pulling, or training around a setup that feels friendlier on the lower back than standing curls. Keep the rep smooth and deliberate so the cable does not yank the shoulder forward at the bottom or pull the torso into rotation as fatigue builds.

Instructions

• Set the low cable pulley to a single handle and sit on the floor beside the stack, close enough that the cable reaches your hand without a hard angle.
• Bend the working-side knee and brace the back of the upper arm against the inside of that thigh, then plant the free hand on the floor behind you for balance.
• Grip the handle with your palm facing up, keep the wrist straight, and start with the arm nearly straight without locking the elbow.
• Sit tall with your chest open and shoulders down, then pin the upper arm to the thigh before you begin the curl.
• Curl the handle toward the front of the shoulder by bending only at the elbow, keeping the upper arm and torso still.
• Squeeze the biceps at the top for a brief pause without letting the elbow slide off the thigh or the shoulder roll forward.
• Lower the handle slowly until the arm is nearly straight again and the cable still has light tension.
• Set the handle back down with control, switch sides, and repeat for the planned number of reps.

Tips & Tricks

• Sit close enough that the cable tracks cleanly with your forearm; if you have to reach or twist, move your seat.
• Use the thigh as a fixed brace, not just a resting point. If the elbow drifts, the set turns into a shoulder-driven curl.
• Choose lighter weight than you would for a standing curl because the floor position and constant cable tension make the rep feel harder at the bottom.
• Keep the wrist stacked over the forearm so the handle does not bend your wrist back as you curl.
• Stop the curl just before the shoulder starts to tip forward; the top squeeze should come from elbow flexion, not from reaching.
• A 2-3 second lowering phase works well here because the cable keeps tension even when the arm is almost straight.
• If the stack pulls your torso toward it, plant the free hand more firmly and rotate your hips until the line of pull feels straight.
• If your forearm burns before your biceps, ease up on grip pressure and make sure the handle sits deep in the palm.

Frequently Asked Questions

What muscles does Cable Seated Floor One-Arm Concentration Curl work?

The biceps are the main target, with the brachialis and brachioradialis helping through the curl.

Why do I do Cable Seated Floor One-Arm Concentration Curl from the floor instead of a bench?

The floor makes it easier to brace the thigh and remove body swing, so the curl stays strict and easy to feel.

Where should my elbow be during Cable Seated Floor One-Arm Concentration Curl?

Keep the upper arm pressed against the inside of the raised thigh so the elbow stays fixed and does not drift forward.

Should I lean back or sit upright for this cable curl?

Sit tall with only a small natural lean if needed to keep the cable line comfortable. If you have to rock back to finish the rep, the load is too heavy.

Is Cable Seated Floor One-Arm Concentration Curl good for beginners?

Yes. The setup makes it easier to learn strict elbow flexion, but beginners should start light so they can keep the thigh brace and wrist position steady.

How heavy should I go on this exercise?

Use a load that lets you keep the elbow pinned, the wrist neutral, and the lowering phase controlled for every rep.

What if the cable path feels awkward?

Move a few inches closer or farther from the stack until the handle travels in a smooth arc to the front of the shoulder without twisting your torso.

Can I swap this for a dumbbell concentration curl?

Yes. The cable version gives more constant tension, while the dumbbell version is a simple substitute if you do not have a low pulley.