# Smith Single Leg Hip Thrust - Canonical: https://fitwill.app/exercise/10399/smith-single-leg-hip-thrust/ - Media ID: 10399 - Primary muscle: Glutes - Body part: Glutes - Equipment: Smith Machine - Video: https://fitwill.app/videos/10399/smith-single-leg-hip-thrust.mp4 ## Description The Smith Single Leg Hip Thrust is a unilateral hip extension exercise performed with your upper back braced on a flat bench and a Smith machine bar resting across your hips. One foot stays planted on the floor to drive the movement, while the other leg is held off the ground or extended forward. Because the Smith machine bar travels on a fixed vertical path, you can focus entirely on driving the hips up without having to stabilize a free barbell from side to side. This movement is built around the glutes. As you press through the working heel and lift your hips to a full lockout, the gluteus maximus does the bulk of the work, with the hamstrings assisting at the hip and the quads and glute of the planted leg controlling your position. The extended leg and the single-sided loading also challenge the core and the hip stabilizers to keep your pelvis level, which is exactly what tends to break down in single-leg work. The single-leg version matters because most people have a stronger and a weaker side, and bilateral hip thrusts let the strong side quietly take over. Training one side at a time exposes that gap, lets you load each glute according to its own ability, and places a large demand on the working glute with far less total weight than a two-legged barbell thrust would require. That makes it a smart choice for lifters building glute strength, runners and field-sport athletes who push off one leg at a time, and anyone rehabbing back into heavier hip loading. Setup is the part that most people rush, and it shows in their results. Your upper back should rest against the bench at about shoulder-blade height, the bar should sit on the crease of the hip with a pad or folded towel for comfort, and your working foot should be far enough forward that your shin is roughly vertical at the top of the rep. If the foot is too close, the knees and quads take over; if it is too far away, the hamstrings and lower back get pulled into the lift. Execution is straightforward but demanding: brace your trunk, tuck your chin, and drive the working heel down until your torso and working thigh form a straight line, squeezing the glute hard at the top. Lower with control until the plates nearly touch the floor or the stack resets, but keep tension in the glute rather than resting between reps. The Smith machine's fixed path and safety catches make it easy to set the bar down safely if you reach failure, which is a real advantage over a free barbell when training solo. Expect to feel this strongly in the working glute from the first few reps, with a secondary burn in the hamstring and a stabilization demand through the trunk and standing hip. Keep the loads modest at first, prioritize a level pelvis and full lockout over heavy plates, and add weight only when every rep looks identical. ## Instructions 1. Place a flat bench inside the Smith machine and position the bar at roughly hip height when you are seated on the floor in front of it. 2. Sit with your upper back against the bench so the bench edge sits just below your shoulder blades, and roll the Smith bar down so it rests across the crease of one hip, using a bar pad or folded towel for cushioning. 3. Bend your working leg and plant that foot flat on the floor, far enough forward that your shin will be close to vertical at the top; extend the other leg straight out or hold the knee bent with that foot off the floor. 4. Grip the bar or the bench with your hands to steady it, then brace your abs and tuck your chin slightly so your ribs stay down. 5. Drive through the heel of the working foot and push your hips up until your torso and working thigh form a straight line, keeping the lifted leg from dropping or swinging. 6. At the top, squeeze the working glute hard and hold for a beat without pushing your lower back into an overextended arch. 7. Lower your hips under control until the bar returns close to the starting position, stopping just before you fully rest the load on the floor. 8. Exhale as you drive up and inhale as you lower, keeping your breathing steady throughout the set. 9. Complete all reps on one side, re-rack the Smith bar by rotating the safety hooks, then switch legs and match the rep count on the other side. ## Tips & Tricks - If the bar digs into your hip, reposition it slightly higher onto the bony hip crease and add a thicker pad; discomfort at the hip is the most common reason people cut this movement short. - Watch for the pelvis rotating toward the working side as you lift. If your hips tilt, lighten the load and think about pushing the lifted side of the pelvis up level with the working side. - Avoid letting the working knee cave inward as you press up; keep the knee tracking over the middle of the foot to protect the joint and keep the glute engaged. - If your quads do most of the work, move your working foot an inch or two further forward so the shin is more vertical at lockout. - Do not hyperextend your lower back at the top. Stop when your torso lines up with your thigh and get the extra range from squeezing the glute, not arching. - The Smith bar's fixed path means you cannot shift sideways to cheat, so any twisting usually comes from the planted foot; make sure that foot stays flat and firmly planted for the whole set. - Start with just the bar or a light load for your first session. The balancing demand of the extended leg makes this feel much heavier than a two-legged thrust with the same weight. - Set the Smith machine safety catches just below the bottom position so that if you fail a rep, the bar settles safely instead of dropping onto your hips. - Keep constant tension by stopping the descent just short of resting the plates on the floor; fully resting between reps turns each rep into a fresh dead-start lift. ## Frequently Asked Questions ### Which muscles does the Smith Single Leg Hip Thrust work? The gluteus maximus of the working leg is the primary mover, with the hamstrings assisting hip extension. The quads and glutes of the planted leg stabilize your position, and the core works to keep the pelvis level under the single-sided load. ### Why use a Smith machine instead of a barbell for single leg hip thrusts? The fixed vertical bar path removes the side-to-side balancing demand, so you can concentrate on driving the working glute to full lockout. The safety hooks also let you bail safely if you fail a rep, which is valuable when training alone. ### Where exactly should the Smith bar sit on my body? It should rest across the crease of your hip, at the top of the working thigh, not on your lower abdomen or thigh muscle belly. Use a bar pad or folded towel, and shift it slightly until the pressure feels tolerable through the whole set. ### What should I do with the non-working leg during the Smith Single Leg Hip Thrust? Either extend it straight out in line with your torso or bend the knee and hold it up, whichever keeps your pelvis level. The key is that it never touches the floor or assists the drive; if it drops or swings, the core and hip stabilizers are losing the battle. ### Is the Smith Single Leg Hip Thrust suitable for beginners? Yes, provided you start with a very light load or just the bar. Many beginners find it easier to first master the bodyweight single-leg hip thrust with the shoulders on a bench, then progress to the Smith machine once they can keep the pelvis level. ### Why do I feel this more in my quads than my glutes? Your working foot is probably positioned too close to the bench, which turns the lift into a knee-dominant press. Walk the foot a bit further forward so your shin is roughly vertical at the top, and focus on pushing the hips toward the ceiling rather than pushing the floor away. ### How high should I lift my hips at the top? Lift until your torso and working thigh form a straight line with a hard glute squeeze, and no further. Pushing past that point arches the lower back instead of adding glute work, and it is one of the most common form faults in this exercise. ### What can I use if my gym does not have a Smith machine? A barbell single-leg hip thrust with your shoulders on a bench is the closest substitute, though it demands more stabilization. A dumbbell held over the working hip or a banded hip thrust are also solid alternatives with lighter setups. ### How do I stay safe when training the Smith Single Leg Hip Thrust alone? Set the safety catches just below the bottom of your range so a failed rep settles on the catches instead of on your hips. Also make sure the bench is stable and cannot slide, and ramp the weight up gradually since the unilateral balance demand surprises most lifters. ### Should both sides get the same number of reps? Yes, match your weaker side's rep count on the stronger side rather than the other way around. This prevents the imbalance between sides from growing over time, which is one of the main reasons to train this movement unilaterally in the first place.