# Opposite Leg Raise - Canonical: https://fitwill.app/exercise/8278/opposite-leg-raise/ - Media ID: 8278 - Primary muscle: Obliques - Body part: Core - Equipment: Body Weight - Video: https://fitwill.app/videos/8278/opposite-leg-raise.mp4 ## Description The Opposite Leg Raise is a standing core exercise where you lift one knee up and across the front of your body toward the opposite side, rotating through your trunk as the leg travels. It is performed with no equipment at all — you simply stand tall, brace your midsection, and drive the knee diagonally upward while keeping your torso controlled. The highlighting in the movement makes the emphasis clear: the abdominal wall and especially the obliques work hard, supported by the hip flexors that lift the leg and the standing-leg muscles that keep you stable. This movement is useful for almost anyone. Because it is done standing with only your body weight, it fits well into warm-ups, home workouts, hotel-room routines, and circuit training. Beginners can use it to learn how to separate hip movement from spinal movement, while more experienced lifters can slow the tempo, add a pause at the top, or increase repetitions to make it genuinely demanding. It is also a practical choice for people who find floor-based core work uncomfortable on the lower back or who want to train the core in a more upright, functional position. The main muscles at work are the internal and external obliques, which rotate and side-flex the trunk as the knee crosses the midline. The rectus abdominis braces to keep the torso from collapsing, the hip flexors — particularly the iliopsoas and rectus femoris — raise the thigh, and the glute of the standing leg along with the smaller stabilizers around the hip and ankle keep your balance. Because the leg moves diagonally rather than straight up, the rotation demand on the waist is what separates this from a plain standing knee raise. Setup matters more than it might seem for such a simple-looking exercise. Your stance should be about hip-width with weight spread evenly across the standing foot, and your ribs should stay stacked over your pelvis before you start. If you begin with an arched lower back or a slouched chest, the rotation at the top tends to come from momentum instead of muscle. One hand can rest near your hip or behind your head for reference — just avoid pulling on the neck or leaning sideways as the knee comes up. To execute it well, think of driving the knee toward the opposite elbow or shoulder rather than simply lifting it straight ahead. Exhale as the knee rises, feel the waist on the working side compress slightly, and pause for a beat before lowering the foot back to the floor under control. The return is where many people rush; a slow lower keeps the abs engaged through the whole range and turns this from a casual leg lift into a real core exercise. Common use cases include core finishers after strength training, dynamic warm-up drills before running or lifting, and balance-focused routines for older trainees, since the single-leg stance adds a stability element that floor crunches lack. Keep the reps controlled rather than fast, stay within a range where your torso stays tall, and progress by adding tempo pauses or more repetitions rather than by swinging the leg harder. ## Instructions 1. Stand upright with your feet about hip-width apart, weight distributed evenly across both feet, and your arms relaxed with one hand resting near your hip or lightly behind your head. 2. Stack your ribs over your pelvis, draw your belly button in slightly, and set a soft bend in the standing knee so you are stable before moving. 3. Shift your weight onto one leg and keep your torso tall and facing forward — this leg now does the stabilizing. 4. Brace your core as if preparing for a light push to the stomach, and take a breath in. 5. As you exhale, drive your free knee up and across the front of your body toward the opposite elbow or shoulder, allowing your trunk to rotate slightly without slumping. 6. Squeeze the waist on the working side at the top of the movement and hold for one count. 7. Lower the leg slowly back to the floor, placing the foot down softly instead of letting it drop. 8. Re-set your posture and brace before the next repetition, keeping the movement on one side for your planned reps or alternating legs as preferred. 9. Breathe out on the lift and in on the lower throughout the set. 10. Complete the desired repetitions, then switch to the opposite leg and match the work on both sides. ## Tips & Tricks - Aim the knee diagonally toward the opposite elbow, not straight up in front of you — the cross-body path is what loads the obliques instead of just the hip flexors. - If you find yourself yanking on the back of your head, move that hand to your hip or hold it loosely near your ear; the neck should stay neutral the entire time. - Watch for the standing foot rolling inward as the knee rises — press through the big toe and keep that foot flat to protect your balance. - A common mistake is swinging the leg for momentum on fast reps; slow the tempo down so the abs, not the swing, control both directions. - Avoid letting your lower back arch and your ribs flare as the leg lowers — this is usually why people feel the movement in the back instead of the waist. - Keep the rotation coming from the trunk and hip, not from the shoulders; your chest should stay mostly forward-facing rather than whipping around. - Add a one- to two-second pause at the top of each rep before progressing to more repetitions — the pause exposes how much of the work momentum was doing. - If balance is shaky, stand next to a wall with one fingertip lightly touching it for reassurance rather than gripping it for support. - Keep the working knee flexed throughout; extending the leg mid-rep turns the exercise into a different movement and reduces the rotation demand on the waist. ## Frequently Asked Questions ### What muscles does the Opposite Leg Raise work? The obliques are the primary movers, as they rotate and side-flex the trunk as the knee crosses your midline. The hip flexors lift the leg, while the lower abs, glutes, and standing-leg stabilizers support the movement. ### Is the Opposite Leg Raise good for beginners? Yes. It requires no equipment, the range is easy to scale, and the single-leg stance gently introduces balance training. Beginners should start with slow, controlled reps and can stand near a wall if balance is a concern. ### Why does the knee cross toward the opposite elbow in the Opposite Leg Raise? The diagonal path is what creates rotation at the trunk, which loads the obliques. Raising the knee straight up would mostly train the hip flexors and leave the waist muscles underworked. ### How is the Opposite Leg Raise different from a standing knee raise? A standard standing knee raise lifts the thigh straight up in front, while the Opposite Leg Raise drives the knee up and across the body toward the opposite side. That cross-body path adds trunk rotation and makes the obliques the focus. ### Why do I feel the Opposite Leg Raise in my hip flexors instead of my abs? The hip flexors always contribute because they lift the thigh, but if they dominate, you are likely lifting straight ahead or rushing the reps. Aim the knee diagonally, slow the tempo, and exaggerate the trunk rotation slightly to shift work into the waist. ### How many repetitions of the Opposite Leg Raise should I do? Start with 8 to 12 controlled reps per side for two to three sets. Because it is a body weight movement, you can progress by adding reps or a pause at the top rather than adding load. ### Can I do the Opposite Leg Raise every day? For most people, yes — it is a low-load, body weight movement and tolerates frequent practice. If you feel lingering soreness in your hips or lower back, give the area a rest day before training it again. ### What can I use instead of the Opposite Leg Raise? Standing cross-body crunches, bicycle crunches, or lying oblique knee tucks train a similar rotation pattern. If balance is the limiting factor, a seated rotation or a supported standing version with a hand on a chair works as a substitution. ### Is it safe to do the Opposite Leg Raise with lower back discomfort? It is generally gentle on the back because you are standing and the range is short, but keep the movement controlled and avoid over-rotating. If any position reproduces discomfort, reduce the range or choose a less rotational core exercise and consult a qualified professional.