Inverted Chin Curl With Bent Knee Between Chairs

Body Part: Upper Arms

Muscle: Biceps

Equipment: Body Weight

Inverted Chin Curl With Bent Knee Between Chairs is a bodyweight pulling exercise for the biceps, forearms, and upper back. You set a bar or sturdy support between two chairs, lie back underneath it, and use an underhand grip to curl your chest toward the bar while your knees stay bent and your feet stay planted on the floor. The bent-knee position shortens the lever and lets you manage how much bodyweight you are lifting.

The exercise works best when the setup is stable and the body stays rigid. The chairs must not slide, the bar must not roll, and your hands should be placed so the wrists can stay straight. A good starting position has the shoulders set down away from the ears, the ribs controlled, and the torso aligned so the pull starts from the arms instead of a hip swing.

During the rep, think of driving the elbows down and back as you bring the upper chest toward the bar. The biceps do the main curling work, while the forearms and brachialis help finish the pull and keep the grip organized. Keep the neck long, avoid shrugging into the bar, and lower yourself slowly until the elbows fully extend again without losing shoulder position.

This is a useful accessory movement when you want a simple way to train elbow flexion, chin-up strength, or upper-arm control without hanging from a full pull-up bar. It also works well for beginners if the support height is manageable and the knees stay bent. If the setup feels unstable, or if the shoulders or elbows pinch at the bottom, reduce the range or switch to a safer pulling variation.

Instructions

• Place a secure bar across two sturdy chairs and position yourself underneath it with your chest centered between the chair backs.
• Grab the bar with a shoulder-width underhand grip, palms facing you, and keep your wrists straight.
• Bend your knees and plant your feet flat on the floor so your body can stay supported and balanced.
• Set your shoulders down and slightly back before you start, then tighten your midsection and keep your ribs from flaring.
• Begin with your arms straight and your torso rigid from shoulders through hips to knees.
• Pull your chest toward the bar by driving your elbows down and back, letting the biceps curl you upward.
• Keep your legs quiet and avoid swinging your hips or kicking through the feet.
• Pause briefly near the top with the chin or upper chest close to the bar, then lower yourself slowly to full arm extension while inhaling.

Tips & Tricks

• A shoulder-width underhand grip usually gives the biceps the clearest line of pull on this variation.
• Keep the chairs heavy and level; any wobble in the setup will steal tension from the arms and make the set risky.
• If your shoulders shrug toward your ears, reset before the next rep and pull the shoulders down first.
• Think about bringing the sternum to the bar instead of reaching the chin forward, which helps keep the neck neutral.
• The bent-knee stance reduces load; moving the feet farther forward or straightening the legs will make each rep harder.
• Lower yourself under control for two to four seconds so the eccentric phase does not turn into a drop.
• Keep the bar deep in the fingers, not jammed into the palm, so the wrists stay stacked over the forearms.
• Stop the set when the hips start to sag or the torso starts to twist, because that usually means the curl is becoming a swing.

Frequently Asked Questions

What muscles does Inverted Chin Curl With Bent Knee Between Chairs train most?

The main emphasis is on the biceps, with the forearms, brachialis, and upper back helping control the pull.

Why are the knees bent in this version?

Bent knees let you share part of the load through your feet and make the row easier to control than a straight-leg version.

Should I use an underhand or overhand grip?

Use an underhand grip if you want the chin-curl emphasis shown here, since it shifts more work toward elbow flexion and the biceps.

How high should I pull on each rep?

Pull until your upper chest or chin reaches the bar without losing body tension or shrugging the shoulders upward.

What is the biggest form mistake?

The most common mistake is turning the movement into a hip swing, which makes the chairs and bar work harder than the muscles.

Can a beginner do this exercise?

Yes, if the setup is stable and the knees stay bent enough to keep the rep smooth and controlled.

How do I make this exercise easier or harder?

Bend the knees more and keep the feet closer for an easier rep; move the feet forward or straighten the legs more to increase the load.

Is this safe to do with chairs?

Only if the chairs are heavy, level, and cannot slide, because the support setup matters as much as the pull itself.