# Lying Alternate Sole Kick - Canonical: https://fitwill.app/exercise/8135/lying-alternate-sole-kick/ - Media ID: 8135 - Primary muscle: Quads - Body part: Thighs - Equipment: Body Weight - Video: https://fitwill.app/videos/8135/lying-alternate-sole-kick.mp4 ## Description The Lying Alternate Sole Kick is a bodyweight floor exercise where you lie on your back with your knees bent and feet flat, then alternately extend one leg at a time by sliding or kicking the sole of your foot away along the floor until the leg straightens, before drawing it back and switching sides. Because one leg always stays loaded while the other moves, it doubles as a leg-strengthening drill and a low-level anti-extension core exercise. The main target is the quadriceps, with particular emphasis on the rectus femoris, the quad head that crosses both the hip and the knee. That dual role is exactly what makes this movement interesting: as your leg kicks out, the rectus femoris and hip flexors work together to control the hip angle while the quads straighten the knee. Your abdominal muscles stay busy the whole time, keeping your lower back from arching as one leg lengthens away from you. This is a low-load, high-control exercise, which makes it a good fit for people rebuilding knee or hip confidence after a layoff, beginners who find straight-leg raises too demanding on the lower back, and lifters who want a smooth activation drill before squats or hinge work. Because the foot stays in contact with or very close to the floor, the knee joint is handled gently through the whole range. Setup matters more than it looks. Lie on your back with knees bent and soles of the feet flat on the floor, close enough to your hips that your knees point up rather than drifting outward. Rest your arms by your sides with the palms down, and gently press your low back toward the floor before you start. That pelvis position is your anchor: if it tips and your back arches, the core work disappears and the hip flexors start pulling you into an awkward position. To execute, exhale and let one foot slide or kick away from you along the floor, keeping the heel and sole low the entire time. Extend until the leg feels long and nearly straight, pause for a beat, then drag the heel back to the start and repeat on the other side. The return is just as important as the kick out, so resist the urge to let the leg flop back in. Aim for slow, even reps, somewhere between eight and fifteen per side, and stop the set as soon as your pelvis starts rocking or your back lifts off the floor. If your lower back bothers you at full extension, shorten the range so the knee stays slightly bent at the far end. As control improves, you can press the sole a little harder into the floor on the kick or float the heel a few centimeters off the ground to raise the difficulty. ## Instructions 1. Lie on your back on an exercise mat or the floor with both knees bent and the soles of your feet flat, roughly hip-width apart and close enough to your hips that your shins are near vertical. 2. Place your arms alongside your body with palms facing down, and gently tilt your pelvis so your lower back presses lightly toward the floor. 3. Brace your abdominal muscles as if preparing for a light poke to the belly, and keep this brace for the whole set. 4. Exhale and slide or kick the sole of your right foot away from you along the floor, letting the knee straighten while the heel stays low. 5. Continue until the right leg is fully extended and feels long, with the sole of the foot either brushing the floor or hovering just above it. 6. Pause for one to two seconds in the extended position, feeling the front of the thigh and hip work without letting the back arch. 7. Drag the heel back along the floor, bending the knee and returning the sole to its starting spot next to the other foot. 8. Repeat the same kick-out with the left leg, then continue alternating sides for equal reps. 9. Breathe steadily throughout: exhale as the leg extends, inhale as it returns, and never hold your breath. 10. Finish the set by drawing both feet back to center, releasing the brace, and resetting your pelvis before the next set. ## Tips & Tricks - If your lower back arches at the end of the kick, stop the leg about three-quarters of the way out. Full extension is a bonus, not a requirement, and a slightly bent knee keeps the pelvis honest. - Keep both hands actively pressing into the floor. They give you feedback: if your knuckles whiten and your ribs flare, you are substituting upper-body tension for core control. - Watch for the working hip hiking upward as the leg kicks out. That means the pelvis is rotating instead of staying square. Imagine a cup of water balanced on your hip bones and keep it level. - The most common mistake is yanking the heel back in quickly. Slow the return down to a two- or three-second drag so the quads and hip flexors work eccentrically, not just the kick-out. - If the floor surface is grippy and your foot snags, wear smooth socks or place a small towel under the heel so the sole can slide freely. - Do not let the knee of the kicking leg drift outward as it extends. Track the kneecap toward the ceiling so the quad does the work instead of the hip. - Keep the resting foot flat and quietly planted. Pushing off with it to help the movement steals work from the leg that is actually kicking. - If your neck or shoulders tense up, rest your head on a thin cushion. Tension there usually signals you are bracing the whole body instead of just the trunk. - Progress by floating the heel one or two centimeters off the floor during the kick-out, not by doing more sloppy reps. Height increases the leverage on the hip flexors quickly. ## Frequently Asked Questions ### What muscles does the Lying Alternate Sole Kick work? The quadriceps are the primary movers, especially the rectus femoris, which spans both the hip and knee. The hip flexors assist on the kick-out, and the abdominal muscles, particularly the lower abs, work isometrically to keep your pelvis and lower back stable. ### Is the Lying Alternate Sole Kick suitable for beginners? Yes, it is one of the more beginner-friendly leg and core drills because your foot stays on or near the floor and the load is just your own limb. Beginners should simply limit how far the leg extends until they can keep their lower back from arching. ### Why do I feel this in my lower abs instead of my thighs? Feeling it in the abs is normal and expected, since they are bracing hard to stop your pelvis tilting as the leg lengthens. You should still feel the front of the thigh and hip on the kicking side, but the burning sensation in the trunk is a sign the core component is working. ### How is the Lying Alternate Sole Kick different from a straight-leg raise? In a straight-leg raise the leg lifts off the floor, which puts much more leverage on the lower back and hip flexors. Here the sole slides along or hovers just above the floor, so the knee and hip are handled more gently and the range is easier to control. ### My back arches when the leg kicks out. How do I fix it? Reduce the range first: kick the leg out only until your back starts to lift, then return. Re-press your lower back toward the floor before each rep and keep your hands flat for feedback, and only lengthen the kick as the arch stays under control. ### Can I do this exercise without a mat? Yes, any firm surface works, though a mat is more comfortable for your spine and tailbone. On a slippery surface like hardwood, smooth socks actually help the sole slide, while on carpet a towel under the heel prevents snagging. ### How many reps and sets should I do? Start with two to three sets of eight to ten kicks per side, moving slowly. As your control improves, build to twelve to fifteen per side or progress to floating the heel rather than adding lots of volume with poor form. ### Can the Lying Alternate Sole Kick be used in knee rehab or after a layoff? It is often used as a gentle reintroduction to knee extension because the foot stays low and the load is minimal, but any post-injury plan should be cleared by your physical therapist or doctor first. Shorten the range and stay pain-free if it has been prescribed as part of recovery. ### What can I substitute if lying on the floor is uncomfortable? The closest alternative is heel slides performed lying down with a towel under the foot, or standing Marches with a band if getting to the floor is the issue. Both train the same knee and hip control with the quad and hip flexors. ### Should both feet stay on the floor the whole time? The resting foot should stay flat and planted to keep the pelvis supported, while only the working sole slides or hovers. If the planted foot lifts or the hips shift, slow down and lighten the range until both sides of the pelvis stay level.