# Cable Standing Single Leg Knee Extension - Canonical: https://fitwill.app/exercise/11206/cable-standing-single-leg-knee-extension/ - Media ID: 11206 - Primary muscle: Quads - Body part: Legs - Equipment: Cable Machine - Video: https://fitwill.app/videos/11206/cable-standing-single-leg-knee-extension.mp4 ## Description Cable Standing Single Leg Knee Extension is a unilateral quad exercise performed at a cable station with a low pulley. You face the machine, brace your hands on the frame for balance, and loop the attachment around the ankle of one leg. From there, you extend that knee forward against the cable's backward pull, then control the leg back to the bent starting position. The standing position changes the character of the movement compared to a seated leg extension machine: your hips, trunk, and supporting leg all have to stabilize while one quad does the work. This exercise is especially useful for people who want to train one leg at a time, whether to address a strength difference between the left and right quadriceps, to rehab a knee with light controlled loading, or to add quad volume when a leg extension machine is busy. Because the cable keeps tension on the quad even when the knee is bent, you do not get the dead spot that often appears with bodyweight leg work. The setup matters more than it looks. Standing close enough to the pulley keeps the cable angle steep, so the resistance pulls your lower leg roughly straight back rather than dragging you off balance. Holding the frame with both hands gives you an anchor so your torso stays quiet and the work stays in the thigh. Your supporting foot should be planted beside the working leg, not staggered far forward, or the cable will pull your hips into a twist. To execute the rep well, keep your torso tall with a slight forward lean, soften the supporting knee, and let the working leg hang with the knee bent behind you. From there, sweep the lower leg forward until the knee is nearly straight, squeeze the quad hard at the front, and lower the leg back under control instead of letting the weight stack yank it down. The kicking leg stays relaxed at the ankle; your quad moves the lower leg, not your hip. Keep the range honest. A full extension is valuable, but the knee should never be slammed or hyperextended at the top, and the weight should be light enough that you can stop the leg at any point of the rep. If your torso starts swinging or your hips rotate to help the leg up, the load is too heavy. Most lifters do well with two to four sets of ten to fifteen slow reps per leg, using this as an accessory after squats, leg presses, or lunges rather than as a main lift. ## Instructions 1. Set the pulley of a cable machine to the lowest position and attach an ankle strap or cuff to one ankle. 2. Stand facing the machine with the strapped leg closest to the pulley, feet roughly together, and grip the frame or handles with both hands at about chest height. 3. Step back just enough that the cable pulls the strapped lower leg slightly behind you with the knee bent around 90 degrees. 4. Shift your weight onto the supporting leg, brace your core, and keep a small forward lean from the hips while your chest stays tall. 5. Exhale and extend the strapped knee forward, sweeping the lower leg up until the knee is almost straight and the quad is fully contracted. 6. Pause briefly at the top without snapping the knee into lockout. 7. Inhale and bend the knee slowly, lowering the lower leg back until it hangs behind you at the starting angle. 8. Keep your hips square and your torso still throughout the set; do not swing the leg or lean back to finish reps. 9. Complete all reps on one leg, then unclip the strap, switch ankles, and repeat on the other side. ## Tips & Tricks - If the cable drags you forward or backward during the rep, adjust your distance from the machine rather than fighting it with your arms; the pulling angle should feel like it goes straight back from your knee. - A common mistake is bending the working hip and driving the thigh up like a kick. The thigh stays put while only the lower leg swings, which is what keeps tension on the quadriceps. - Do not let the weight stack slam down between reps. Two seconds of controlled lowering builds more quad strength and protects the knee better than fast, loose reps. - If your balance wobbles, widen the support foot slightly and hold the frame with a firmer grip before reducing the weight. - Point the toes of the working leg relatively neutral. Twisting the ankle outward or inward changes how the knee tracks and can irritate it. - Start with a much lighter load than you would use on a seated leg extension machine. Standing eliminates the backrest, so the stabilizing demand is higher. - If you feel strain behind the knee at full extension, shorten the range slightly and focus on a strong squeeze at 90 percent of lockout. - Keep the supporting knee soft rather than locked. A locked support knee makes it harder to balance and shifts tension away from the working side. ## Frequently Asked Questions ### Which muscles does Cable Standing Single Leg Knee Extension work? The quadriceps on the front of the thigh are the primary movers, since they extend the knee against the cable. The glutes and the muscles around the hip and ankle work to keep you stable while standing on one leg. ### Why do this standing instead of using a seated leg extension machine? Standing removes the backrest, so your trunk, hips, and supporting leg must stabilize while one quad works. It is also a good option when a leg extension machine is occupied or unavailable, since all you need is a low pulley and an ankle strap. ### Is Cable Standing Single Leg Knee Extension suitable for beginners? Yes, as long as the weight is kept light and the tempo is slow. Beginners often benefit from holding the frame firmly and starting with just a few kilograms to learn the knee-dominant movement before adding load. ### How close should I stand to the cable machine? Stand close enough that the cable runs steeply down from the pulley to your ankle. If you drift too far back, the cable pulls you backward at an angle and the resistance no longer matches the knee's natural arc. ### Should my knee lock out completely at the top of each rep? Extend to nearly full lockout and squeeze the quad, but avoid snapping or forcing the joint straight, especially under heavier load. A deliberate pause with the muscle contracted gives most of the benefit without hammering the joint. ### Why do my hips rotate when I do this exercise? Rotating usually means the weight is too heavy or your stance is unstable, so your body turns to help the leg move forward. Reduce the load, square your hips toward the machine, and grip the frame more firmly before progressing. ### Can I train both legs in the same set? Finish all reps on one leg, then rest briefly and switch the strap to the other ankle. Alternating rep by rep is awkward because you have to reattach the strap and reset your stance each time. ### What can I use if my gym has no ankle strap for the cable machine? A double-loop handle or stirrup attachment wrapped securely around the ankle can work in a pinch. Make sure it is padded and fastened snugly above the ankle bone so it cannot slip during the set. ### How many reps and sets should I do? Two to four sets of ten to fifteen controlled reps per leg works well as a quad accessory after your main lower body lifts. Because the standing position limits how much load you can stabilize, higher reps with strict form tend to be more productive than low-rep heavy sets. ### Is this exercise safe for the knees? With light to moderate weight, a slow tempo, and a controlled lockout, it is a knee-friendly way to load the quadriceps. Stop and reduce the range or load if you feel sharp pain in or around the knee joint rather than muscle effort.