# Side Bridge With Bent Leg - Canonical: https://fitwill.app/exercise/10685/side-bridge-with-bent-leg/ - Media ID: 10685 - Primary muscle: Obliques - Body part: Core - Equipment: Exercise Mat - Video: https://fitwill.app/videos/10685/side-bridge-with-bent-leg.mp4 ## Description The Side Bridge With Bent Leg is a beginner-friendly variation of the classic side plank that takes much of the load off while keeping the anti-lateral-flexion challenge intact. Instead of balancing on your feet, you bend your bottom knee to about ninety degrees and rest that knee on the floor, so your lower body has a wide, stable base. Your top leg stays straight and in line with your trunk, and you support your upper body on one arm with the elbow either bent or extended, then lift your hips until your body forms one straight line from head to knee. The bent-knee setup matters because it cuts the leverage the side bridge normally demands. With only the side of the bottom knee and the supporting arm on the ground, the moment arm your obliques must resist is far shorter than in a full side plank on the feet. That makes this version ideal if you are new to side bridging, returning from time away from training, working on core control after lower back discomfort, or simply building toward the straight-leg version without letting your hips sag or your spine twist. The main work happens on the side of your body facing the floor. The obliques, along with the quadratus lumborum deep in your lower back, contract hard to hold your ribcage and pelvis level so your waist does not collapse toward the mat. The abs brace to keep the trunk rigid, the glute on your top side helps keep that leg in line with your torso, and the shoulder of the supporting arm stabilizes as it transfers force from your trunk to the floor. This is an isometric hold, so the goal is steady tension under control rather than movement through a range. To perform it well, think about stacking rather than straining. Your supporting shoulder should sit directly over your elbow or hand, your hips should stay square to the side rather than rolling forward or back, and your head should continue the line of your spine. Lift your hips only as high as you can while keeping that straight line, breathe steadily through the hold, and lower down under control before switching sides. If your form breaks, the most honest fix is to hold for less time rather than letting the hips drift down and the waist fold. You will see this exercise used in core warm-ups, rehabilitation and postpartum return-to-training progressions, and as a stepping stone toward full side planks and more advanced lateral core work. Because the floor-based knee support reduces wrist and shoulder stress, it also suits people who find the straight-leg version too demanding on the upper body. Hold each side for twenty to forty seconds, match the time on both sides, and progress by extending the hold or straightening the bottom leg once the bent-leg version feels solid. ## Instructions 1. Lie on your side on an exercise mat with your legs stacked and your body in a straight line from head to feet. 2. Bend your bottom knee to roughly ninety degrees so that knee rests on the mat, and keep your top leg straight and in line with your torso. 3. Place your bottom forearm flat on the mat with the elbow under your shoulder, or extend that arm and plant the hand on the mat if you prefer a straight-arm support. 4. Rest your top hand on your hip or along your top thigh, and turn your gaze forward so your neck stays neutral. 5. Brace your abs and squeeze your glutes before you lift, keeping your hips stacked directly on top of each other. 6. Press through your forearm or hand and the side of your bottom knee to raise your hips until your body forms one straight line from your head to your knees and top foot. 7. Hold the top position with your ribcage lifted and hips level, breathing steadily without letting your waist sag toward the mat. 8. Lower your hips back to the mat slowly and with control rather than dropping them. 9. Complete your planned hold time, then reset on the mat before switching to the other side for an equal hold. ## Tips & Tricks - Check your hips in a mirror or record a short video: if the top hip creeps forward, you are cheating the obliques out of their anti-rotation job, so pull the hips back into a stacked position. - If the supporting shoulder starts to shrug toward your ear, press deliberately through the floor and think about pushing the mat away to create space around the shoulder joint. - A sagging waist is the most common failure point in this exercise; when you feel the hips drift down, end the set instead of grinding through a collapsed position. - Keep the top leg actively lifted and in line with your trunk rather than letting it rest heavily on the bottom leg, which keeps the top glute engaged. - If your wrist complains during the straight-arm version, drop to the forearm support or make a fist and balance on the flat fist instead of a bent wrist. - Exhale as you lift into the bridge and keep the breath quiet and rhythmic during the hold; holding your breath usually coincides with losing trunk tension. - Cushion the bottom knee with a folded mat or pad if the floor feels sharp, since discomfort there will distract you from bracing properly. - Once forty seconds per side feels easy, straighten the bottom leg to transition toward a full side plank rather than just adding more time. - Do the weaker or tighter side first so both sides get the same quality of work while you are fresh. ## Frequently Asked Questions ### Which muscles does the Side Bridge With Bent Leg work? The primary work comes from the obliques and the quadratus lumborum on the downsides of the trunk, which hold your body in a straight line against gravity. The abs, the glutes, and the stabilizing muscles of the supporting shoulder assist throughout the hold. ### Why is the bottom knee bent in this version instead of the legs being straight? Bending the bottom knee and resting it on the floor shortens the lever your core must hold up, which makes the exercise much more manageable. It lets you learn the straight-line position and build oblique strength before progressing to a full side plank on the feet. ### Should I support myself on my forearm or on a straight arm? Both are valid. The forearm version is easier on the wrist and gives a more stable base, while the straight-arm version adds shoulder work. Choose the one that lets you keep your shoulder stacked over your support without pain. ### How long should I hold the Side Bridge With Bent Leg? Start with twenty to thirty seconds per side and build toward forty to sixty seconds with clean form. Time under tension matters less than keeping the hips level and the body in one line, so end the set when your form slips. ### Is it normal to feel this in my shoulder instead of my waist? Some shoulder involvement is expected because that arm is transferring your body weight to the floor, but the burn should center on your lower ribs and waist. If the shoulder dominates, check that your elbow or hand is directly under your shoulder and that you are not shrugging. ### What is the most common mistake in this exercise? Letting the hips sag toward the mat or rolling the top hip forward as fatigue sets in. Both reduce the load on the obliques and shift stress into the lower back, so cut the hold short and keep the pelvis stacked and level. ### Can beginners do the Side Bridge With Bent Leg? Yes, it is one of the best entry points into lateral core training. If even this version is too hard, keep the hips lower and hold for shorter bursts, or practice the setup with the hips still on the mat while you learn to brace. ### What can I use instead if this exercise bothers my knee or shoulder? A standing side bend with a light weight, a side-lying hip lift on a bench, or a Pallof press all train the obliques with less pressure on the knee and supporting arm. Padding the knee or switching to forearm support often solves the issue on its own. ### How do I progress from this movement to a full side plank? Once you can hold forty or more seconds per side with level hips, straighten the bottom leg so your weight moves onto the side of your bottom foot. You can also lift the top leg slightly or hold a light plate on your top hip for added challenge. ### Should I do both sides in the same set? Yes, always match the hold time on each side, even if one side feels stronger. Training both sides equally helps prevent the side-to-side imbalances that this exercise is often prescribed to correct.