# Box Assisted Pull Up - Canonical: https://fitwill.app/exercise/9511/box-assisted-pull-up/ - Media ID: 9511 - Primary muscle: Back - Body part: Upper Back - Equipment: Pull-Up Bar - Video: https://fitwill.app/videos/9511/box-assisted-pull-up.mp4 ## Description Box Assisted Pull Ups are a scaled version of the classic pull up where you kneel on a sturdy box or jump platform positioned under or just behind the pull up bar. The box shortens the distance your body has to travel and lets you use your legs to push off at the bottom, so you only lift a portion of your body weight with your upper body. This makes it one of the most practical ways to build toward a full, unassisted pull up without needing bands or an assisted machine. The exercise primarily trains the lats, with strong involvement from the biceps, mid traps, rhomboids, and rear shoulders, plus your forearms working hard to hold the bar. Because you still hang freely from the bar rather than sitting on a machine pad, your core also has to keep your body from swinging, which carries over well to strict pull ups later on. Setup matters a lot with this variation. The box height determines how much help you get: a higher box means your knees or shins rest on it through more of the range, while a lower box leaves you doing most of the work with your back and arms. Position it so that at the bottom of the rep your arms are nearly straight but you can lightly touch the box for support, not plant yourself on it. To perform it well, grip the bar slightly wider than shoulder width with palms facing forward, kneel or place the balls of your feet on the box, and start each rep from a controlled hang. Pull by driving your elbows down and back toward your ribs, aiming to bring your chin clearly over the bar while keeping your chest tall. Lower yourself slowly until your arms are extended again, letting the box take just enough load to keep the next rep clean. This movement fits perfectly at the start of a back session for someone who cannot yet do full pull ups, or as higher-repetition finisher work for those who can. It is also a smart option when you are fatigued and want to accumulate quality pulling volume without losing technique. Adjust the box height as you get stronger so the assistance gradually disappears over time. The main safety point is controlling the descent. Dropping into the bottom position and bouncing off the box stresses the shoulders and elbows and cheats the lats out of the work. Keep the movement smooth, avoid swinging, and step off the box rather than jumping down when you finish your set. ## Instructions 1. Place a sturdy plyo box or step platform directly under or slightly behind the pull up bar, choosing a height that lets your arms hang nearly straight when you kneel on top of it. 2. Grip the bar with an overhand grip, hands slightly wider than shoulder width, thumbs wrapped around the bar. 3. Kneel on the box with the tops of your feet or balls of your feet resting on it, and let your hips hang so your arms reach full extension at the bottom. 4. Brace your core and squeeze your glutes lightly to stop your lower body from swinging before you initiate the pull. 5. Pull yourself up by driving your elbows down toward your hips, keeping your chest lifted and your shoulders pulled away from your ears. 6. Continue pulling until your chin clears the bar and your upper arms are roughly parallel to the floor or slightly below. 7. Pause briefly at the top, then lower yourself under control over two to three seconds until your arms are almost fully extended. 8. Breathe out as you pull up and breathe in as you lower yourself back down. 9. Lightly touch the box with your knees or feet at the bottom to shed a little load, then begin the next rep without bouncing. 10. When your set is done, place both knees firmly on the box, let go of the bar, and step down carefully rather than dropping. ## Tips & Tricks - If you find yourself pressing hard off the box with your legs every rep, the box is too high; drop to a lower height so your lats and biceps do the majority of the pulling. - Do not turn this into a box jump squat pull. Your legs should provide only light support at the bottom, not launch you toward the bar. - Avoid the common mistake of shrugging your shoulders up to your ears at the start. Depress your shoulder blades first, then pull. - Keep your chin reaching over the bar rather than craning your neck backward; your head stays neutral as your chest rises toward the bar. - If your grip gives out before your back does, chalk your hands or use a thumbless-on-top adjustment to reduce forearm burnout. - Slow down the last third of the lowering phase. The stretch under control is where much of the strength for unassisted pull ups is built. - Watch for hip drift toward the box. Keep your body roughly vertical and stacked under the bar so the pulling path stays straight. - Progress by lowering the box height over weeks, then by using the box only for the first rep of each set instead of every rep. - Wipe the bar or use a towel if sweaty hands make you slip, since a kneeling position leaves you less able to react to a sudden release. ## Frequently Asked Questions ### Which muscles does the Box Assisted Pull Up work? The lats are the primary movers, supported by the biceps, mid traps, rhomboids, and rear shoulders. Your forearms and grip work throughout to hold the bar, and your core stabilizes the hanging position. ### Is the Box Assisted Pull Up good for beginners? Yes, it is one of the best entry points to pulling exercises because the box height lets you dial in exactly how much of your body weight you are lifting. As you get stronger, you simply use a lower box. ### How high should the box be for Box Assisted Pull Ups? Choose a height where, kneeling on the box and hanging from the bar, your arms are close to fully extended but you can still lightly touch the box for support. If your legs are doing most of the pushing, the box is too tall. ### How is the Box Assisted Pull Up different from a band assisted pull up? A band gives the most help at the bottom and less at the top, while a box lets you self-regulate by adjusting how much you press off with your legs. The box version also lets you train partial assistance within a single set, which some people find easier to progress. ### Should my knees stay on the box for the entire rep? Not necessarily. Many people kneel fully at the bottom and let the knees drift back and away as they pull to the top, which naturally reduces assistance where you are strongest. Just keep contact light and controlled. ### Why do my biceps fatigue faster than my back on this exercise? This usually means you are pulling with your arms instead of initiating with your shoulder blades. Cue yourself to pull your elbows down toward your hips and think of your hands as hooks. ### Can I use the Box Assisted Pull Up if I can already do strict pull ups? Absolutely. It works well as a high-repetition back finisher or as a way to accumulate extra volume on days when full pull ups would break down too early. ### What is the most common mistake with the Box Assisted Pull Up? Bouncing off the box to launch into each rep. This removes tension from the lats and can jar the shoulders, so reset briefly at the bottom and pull from a controlled hang instead. ### Is it safe to let go of the bar while kneeling on the box? Set the box at a height where you can kneel down onto it with both knees before releasing the bar, and always step off rather than jumping down. If the box feels unstable, choose a heavier plyo box or a dedicated step platform.