Bench-Assisted Chin-Up
What Is the Bench-Assisted Chin-Up?
Bench-Assisted Chin-Up is a compound exercise that primarily targets the back and also engages the biceps, the forearms and, through the leg drive, the quadriceps and glutes. It is a beginner-level movement: you hold a chin-up bar with an underhand grip while half-kneeling on a bench set underneath it, then pull yourself up into a tall split stance with help from your front leg.
The point of the exercise is to practice the full chin-up before you can lift your whole body weight. Because your legs supply only as much help as you need, you can work through the complete range, from straight arms to chin at the bar, and gradually hand more of the work to your back and arms as you get stronger. A plyo box or any stable box of similar height works just as well as a bench, so the exercise is easy to set up in most gyms. It usually fills the vertical pulling slot of an upper-body or full-body session for anyone still working toward an unassisted Chin-Up.
The latissimus dorsi does most of the pulling, helped by the teres major, the muscles between the shoulder blades and the elbow flexors. The underhand grip is what makes this a chin-up rather than a pull-up, and it brings the arms in more: in a study of 25 young adults doing full, unassisted chin-ups and pull-ups, the chin-up produced higher biceps and chest activity, while the overhand pull-up worked the lower trapezius harder. If you want the overhand version of this same drill, use the Box-Assisted Pull-Up. The front leg's quadriceps and glutes do the assisting, so they work too, but only as hard as you let them.
This variation suits beginners, people returning to training and anyone who can hang from a bar but cannot yet complete a chin-up. If even a leg-assisted rep is too hard, build grip and shoulder control with the Dead Hang and the Scapular Pull-Up, and pulling strength with the Cable Lat Pulldown (Reverse Grip). Once the legs are barely helping, the Negative Chin-Up and the Chin-Up Hold are the usual next steps toward a full rep.
Muscles Worked
- Latissimus Dorsi
- Primary
- Biceps Brachii
- High
- Brachialis
- High
- Brachioradialis
- Medium
- Infraspinatus
- Medium
- Lower Trapezius
- Medium
- Pectoralis Major
- Medium
- Teres Major
- Medium
Instructions
- Place a flat bench, or a stable box of similar height, directly under a pull-up bar.
- Step onto the bench and take an underhand grip on the bar, palms facing you, hands about shoulder-width apart.
- Lower into a half-kneel on the bench: one foot flat in front, the back knee bent and hovering just above the bench, and the toes of the back foot on the bench.
- Let your arms straighten overhead with your torso upright, and brace your abs.
- Pull your shoulder blades down and back slightly before your elbows bend.
- Pull your elbows down toward your ribs while pushing through your front foot only as much as you need to keep moving.
- Rise into a tall split stance and keep pulling until your chin reaches the bar, bringing your chest toward it without craning your neck.
- Pause briefly at the top.
- Lower slowly over two to three seconds until your arms are straight and you are back in the half-kneel, without letting your back knee touch down hard.
- Repeat for the set, and switch your front leg between sets.
Common Mistakes
Letting the legs do the work
Driving hard through the front foot turns the rep into a split squat with a hand hold, so use only as much leg push as you need to keep moving.
Cutting the range short
Stopping before the arms are straight at the bottom or before the chin reaches the bar skips the parts of the chin-up you most need to practice.
Craning the neck to reach the bar
Poking the chin up and forward makes the rep look complete while the body stays low, so bring the chest toward the bar instead.
Shrugging at the top
Letting the shoulders ride up toward the ears takes tension off the back, so keep the shoulder blades pulled down as you finish each rep.
Dropping back into the half-kneel
Sinking quickly wastes the lowering phase and can knock the back knee into the bench, so take two to three seconds to come down.
Using an unstable platform
A bench or box that wobbles, slides or sits off to one side of the bar makes every rep uneven and risks a fall.
Injuries
Bench-Assisted Chin-Up is a low risk exercise when performed with proper technique. Your legs support part of your body weight and your feet never leave the platform, so the load on the shoulders and elbows is lower than in a full chin-up, and you can step off at any moment.
The main strain points are the elbows and the front of the shoulders. The underhand grip puts more work through the biceps and brachialis, and their tendons at the elbow can get irritated when volume climbs too quickly. The straight-arm bottom position holds the arms fully overhead, which some lifters with a history of shoulder pain or instability find uncomfortable. Start each rep by setting the shoulder blades down and back, lower under control rather than dropping into the half-kneel, and add sets and reps gradually.
The setup matters as much as the technique. Use a bench or box that is solid and will not tip or slide, place it directly under the bar, and lower slowly enough that your back knee does not bang into it. To make the exercise easier, push more through your front foot. To make it harder, use less leg drive and take longer to lower, then progress to the Negative Chin-Up. If the underhand grip bothers your elbows, the overhand Box-Assisted Pull-Up shifts some of the work away from the biceps.
Stop the set if you feel sharp pain in the elbow, the front of the shoulder or the wrist, or any numbness or tingling in the hands. Pain that persists after training should be checked by a qualified clinician before you continue.
- Primary Focus
- Back
- Equipment
- Pull-up bar, bench, and body weight
- Modality
- Strength
- Difficulty
- Beginner
Alternative Exercises
Other Names for the Bench-Assisted Chin-Up
The Bench-Assisted Chin-Up is also known as:
- Box-Assisted Chin-Up
Frequently Asked Questions
- Q: Can I use a box instead of a bench?
Yes. A plyo box or any stable box of similar height works just as well as a bench. What matters is that it is solid, does not slide, sits directly under the bar and lets you hold the bar with straight arms from the half-kneeling position.
- Q: How is this different from the Box-Assisted Pull-Up?
Both use a platform under the bar so the legs can help, but this version uses an underhand grip with the palms facing you, which brings the biceps in more and makes the pull a little easier for most people. The Box-Assisted Pull-Up uses an overhand grip and is the better choice if you are working toward a pull-up rather than a chin-up.
- Q: How do I make it easier or harder?
Push more through your front foot to make it easier, or press as lightly as you can to make it harder. A slow lowering phase of three to five seconds and a short pause with your chin at the bar also add difficulty without changing the setup.
- Q: When am I ready for a full chin-up?
A good sign is being able to do 3 sets of 8 to 10 smooth reps while pressing only lightly through your front foot. At that point add the Negative Chin-Up to your sessions and test a full Chin-Up every week or two.
- Q: Is leg assistance better than a resistance band?
Neither is better for everyone. With your feet on a bench you can give yourself exactly as much help as each part of the rep needs, while the Band-Assisted Chin-Up has you hanging freely like a real chin-up but gives the most help at the bottom, where the band is stretched furthest.