Lever Lying Leg Raise Bent Knee
- Target muscle
- Iliopsoas, Rectus Abdominis
- Synergist muscles
- Quadriceps, Sartorius
- Equipment
- Leverage machine
- Body part
- Waist
- Type
- Strength
The Lever Lying Leg Raise Bent Knee is a leverage machine exercise that primarily targets the iliopsoas and rectus abdominis, with assistance from the quadriceps and sartorius. Performed lying flat with knees bent, the machine's guided support allows you to isolate the hip flexors and lower abdominals with controlled resistance. It is well suited for building core and hip flexor strength with reduced lower back strain compared to straight-leg variations.
How to do the Lever Lying Leg Raise Bent Knee
- 1Adjust the leverage machine so the back pad is flat and the leg pad or roller aligns with your lower shins when your hips are at the edge of the platform.
- 2Lie flat on your back on the machine pad, gripping the handles beside your hips or above your head for stability.
- 3Bend your knees to approximately 90 degrees, keeping your feet together or hip-width apart with your lower legs parallel to the floor.
- 4Press your lower back firmly into the pad and brace your core before initiating any movement.
- 5Exhale and raise your knees toward your chest in a smooth arc, driven by your hip flexors and lower abdominals — stop when your thighs are perpendicular to the floor or slightly past vertical.
- 6Hold the top position for one second, feeling the contraction in your iliopsoas and rectus abdominis.
- 7Inhale and lower your legs slowly back to the starting position under full control, resisting the weight on the way down.
- 8Stop the descent just before your feet or legs touch any support surface so tension remains on the target muscles throughout the set.
- 9Complete all repetitions, then carefully exit the machine.
Form tips
- Keep your lower back pressed into the pad throughout the entire set — any arching shifts stress away from the iliopsoas and rectus abdominis and onto the lumbar spine.
- Initiate the movement from your hips and abdomen, not by swinging your torso or jerking with momentum.
- Maintain the bent-knee position consistently; allowing the knees to straighten during the raise changes the lever arm and recruits different muscle groups.
- Breathe out as you raise your knees and breathe in on the controlled descent to help maintain intra-abdominal pressure and spinal stability.
Common mistakes
- Allowing the lower back to arch off the pad — this unloads the rectus abdominis and iliopsoas and transfers force directly into the lumbar vertebrae, increasing injury risk.
- Using momentum or swinging the legs — bouncing at the bottom removes time under tension from the target muscles and places uncontrolled stress on the hip flexor tendons.
- Letting the knees drift apart or the feet drop during the movement — losing the bent-knee position alters recruitment and can cause the quadriceps to dominate rather than the iliopsoas.
- Rushing the eccentric (lowering) phase — a fast descent eliminates the controlled stretch-load on the iliopsoas and rectus abdominis, significantly reducing the training stimulus.
- Setting the machine pad height incorrectly — if the hips are too far from the edge, the range of motion is restricted; too close and the pelvis may tilt uncontrollably, limiting the abdominal contraction.
Frequently asked questions
What muscles does the Lever Lying Leg Raise Bent Knee work?
The primary muscles targeted are the iliopsoas (hip flexors) and rectus abdominis (the front abdominal wall). The quadriceps and sartorius act as synergists, assisting with knee and hip positioning throughout the movement.
Is the Lever Lying Leg Raise Bent Knee good for beginners?
Yes. The leverage machine provides back support and a guided path, making it easier to learn proper form than floor-based leg raises. Beginners should start with a light resistance setting, focus on pressing the lower back into the pad, and prioritize controlled movement over load.
Why do bent knees instead of straight legs?
Keeping the knees bent shortens the lever arm created by the legs, which reduces the load on the lower back and makes the exercise more manageable while still effectively targeting the iliopsoas and rectus abdominis. Straight-leg variations increase the moment arm and lumbar demand significantly.
How many sets and reps should I do?
For core and hip flexor endurance, 3–4 sets of 12–20 reps with a controlled tempo and 45–60 seconds rest works well. For strength-focused training, 3–4 sets of 8–12 reps with added resistance is effective. Focus on quality of contraction over speed or load.
What are good alternatives to the Lever Lying Leg Raise Bent Knee?
Effective alternatives that work the same primary muscles include the hanging knee raise, the captain's chair knee raise, and the flat bench lying bent-knee leg raise. All target the iliopsoas and rectus abdominis but differ in the level of stabilization required and the degree of leverage machine support.
