Yes, leg raises can work the obliques when you brace your core and use angled or twisting variations instead of only lifting straight up and down.
When you ask do leg raises work obliques?, you are really asking how much side-core help you get from a simple leg lift. Many people treat leg raises as a lower-ab move only, then feel confused when their sides stay soft while their hip flexors feel tired. The truth sits in the middle: standard leg raises hit the rectus abdominis and hip flexors the most, while your obliques help steady the trunk and can work hard when you change the angle or add rotation.
This article walks through how leg raises load your core, when they give your obliques real work, and which tweaks turn a straight-up leg lift into a side-carving move. You will also see how to program sets, reps, and weekly volume so your obliques get enough stimulus without beating up your lower back or hips.
Do Leg Raises Work Obliques? Core Answer And Context
The short answer is yes: leg raises can train the obliques, but they do not all hit the sides to the same degree. In a lying or hanging leg raise, the main drivers are the hip flexors and the rectus abdominis. Your obliques contract to keep the pelvis steady and to stop the lower back from arching, which means they work isometrically even when you keep both legs in line with the body.
Research on trunk exercises shows that bilateral leg raises create high activation in the rectus abdominis and meaningful work in the internal obliques when the spine and pelvis stay controlled. A study on trunk exercise activation found that horizontal leg raises produced more internal oblique activity than some common plank positions, underscoring how much side-core effort can show up when the movement is strict and the body stays stable. PubMed data on trunk exercise activation
That said, if you swing the legs, arch your lower back, and let the pelvis tip forward, your obliques lose tension and the stress shifts toward joints and soft tissue that do not like that load. The goal is to treat every leg raise as a core-first move, not a loose leg swing.
How Leg Raises Work Your Core Muscles
To understand how much oblique work you get, it helps to look at the full core lineup in a leg raise. The main players are the hip flexors (especially the iliopsoas), the rectus abdominis through the front of the trunk, and the internal and external obliques along the sides. When you lift the legs, these muscles share the job of bending the hips, holding the spine still, and setting the ribs over the pelvis.
Medical sources describe the external oblique as a broad muscle that helps flex the trunk forward, bend it to the side, and rotate it along with the internal oblique. The internal obliques sit just under the externals and help twist and bend the trunk as well. Cleveland Clinic explanation of abdominal muscles During leg raises, those side muscles tighten to keep the pelvis from rolling and to stop the lower back from collapsing toward the floor or flaring while you hang.
The table below shows how common leg raise variations spread the work across these muscles and how much direct oblique effort each one tends to demand.
| Leg Raise Variation | Main Muscles Working | Oblique Involvement |
|---|---|---|
| Lying Bent-Knee Leg Raise | Hip flexors, rectus abdominis | Low to moderate, holds pelvis steady |
| Lying Straight-Leg Raise | Hip flexors, rectus abdominis | Moderate, more core bracing needed |
| Hanging Knee Raise | Hip flexors, rectus abdominis, grip | Moderate, trunk control in swing |
| Hanging Straight-Leg Raise | Hip flexors, rectus abdominis | Moderate to high, strong bracing |
| Hanging Oblique Knee Raise | Hip flexors, rectus abdominis | High, trunk rotated toward side |
| Windshield Wiper Leg Raise | Rectus abdominis, obliques | Very high, legs sweep side to side |
| Side-Lying Leg Raise | Hip abductors, lateral core | Moderate, pelvis held level |
From this overview you can see that straight-up leg raises give your obliques work mainly through bracing, while angled variations turn the sides into prime movers. Both types matter if you want a strong, balanced waist.
Leg Raises And Obliques: When They Work Hardest
Your obliques fire in any leg raise where the trunk has to stop rotation or create rotation. That happens in two main ways. First, they act like guy wires on a tower, stopping the body from swaying or twisting while the legs move. Second, they help guide the pelvis and ribs when you bring the knees or feet toward one side of the body.
In a strict hanging leg raise with both legs straight, the obliques contract on both sides of the trunk to keep the pelvis level and keep the ribs stacked over the hips. If you let your body swing forward and backward, that shared tension drops and the movement turns into a loose arc rather than a controlled raise. When you twist slightly, such as drawing both knees toward the right elbow, the left external oblique and right internal oblique work harder to bring and hold the legs on that diagonal path.
The more you drive the legs or knees toward one side and the more you fight rotation on the way back to center, the more your obliques work. On the other hand, if you only lift the legs a small distance with a soft brace, you get far less side-core stimulus, even though you still feel the front of your abs and hip flexors.
When Standard Leg Raises Are Enough For Your Obliques
For someone new to core work, basic lying or hanging leg raises already give the obliques solid work because they are not yet used to bracing. Holding a neutral spine, pulling the ribs down, and keeping the pelvis from tipping forward all demand effort from both internal and external obliques on every rep.
If your current goal is general trunk strength, better control over your posture, or a foundation for other sports, standard leg raises with strict form will help. You do not need extreme twisting moves right away. Instead, you need steady progress: full-range reps, slow lowering, and no swinging.
Signs that your obliques are already working include a firm feeling along the sides of your waist at the bottom of each rep, less sway through your hips, and better control when you raise and lower your legs. Once those skills feel natural and you can complete two or three strict sets without losing position, you are ready to add more side-loaded versions.
Best Leg Raise Variations For Oblique Emphasis
When you want the obliques to move the load rather than only brace it, you shift from straight-line leg raises to angled or twisting patterns. The variations below keep the basic leg raise shape but change the path of the knees or feet so your sides work harder.
Hanging Oblique Knee Raise
This move keeps the range manageable while loading the sides in a clear way. You need a pull-up bar or sturdy overhead handle.
- Hang with hands just wider than shoulder width, ribs pulled down, and legs hanging straight.
- Lightly tuck the pelvis under so your lower back is not arched.
- Draw both knees up toward one elbow in a smooth arc, turning the pelvis slightly as the knees rise.
- Pause for a breath with the knees near the elbow, then lower under control to the start.
- Repeat to the same side, then switch to the other side for the same number of reps.
You should feel the lower abs working along with a strong tightening along the side closest to the bar plus the opposite inner side of the waist.
Hanging Windshield Wipers
This variation suits people who already have strong core control and healthy shoulders. It creates large side-to-side forces on the trunk.
- Hang from the bar and bring both legs up so your hips and knees form about a right angle, or keep the legs straighter if you have the strength.
- From that raised position, slowly sweep your legs as one unit toward the right side while keeping your shoulders level.
- Stop before your shoulders twist, then sweep through center toward the left side.
- Keep the movement smooth and short at first; lengthen the sweep only when your obliques can hold the pelvis stable.
This move creates strong anti-rotation work for both internal and external obliques as they fight to keep your ribs from twisting away from the bar.
Side-Lying Leg Raise With Trunk Tension
Side-lying leg raises are often treated as a hip move, but they can also train the lateral core when you keep the rib cage stacked and the waist held long.
- Lie on one side with legs stacked, head supported, and bottom arm stretched out or bent under your head.
- Pull the lower ribs away from the floor a little so your waist is not sinking.
- Lift the top leg toward the ceiling while keeping the pelvis still, then slowly lower.
- Keep the movement small enough that your trunk does not roll backward or forward.
Here the obliques work with the hip muscles to keep the pelvis level, which helps the outer hip muscles and the sides of the trunk share the load.
Programming Leg Raises For Oblique Training
To get stronger obliques from leg raises, you need enough weekly volume, a mix of straight and angled moves, and rest days so the trunk muscles can adapt. A simple way to think about it is to include leg raises on two or three non-consecutive days per week and to alternate between basic and oblique-heavy variations.
Strength-focused work lives in the six to ten rep range for harder moves, while stability and conditioning sessions can push sets of ten to fifteen smooth reps. Long, sloppy sets take tension away from the obliques and send stress toward the lower back, so it is better to stop a set once you feel your form start to drift.
| Goal | Suggested Leg Raise Mix | Sets And Reps |
|---|---|---|
| General Core Strength | Lying bent-knee plus hanging knee raises | 2–3 sets of 8–12 reps each |
| Oblique Emphasis | Hanging oblique knee raises, side-lying raises | 3–4 sets of 8–10 reps per side |
| Advanced Core Control | Windshield wipers, hanging straight-leg raises | 3 sets of 6–8 slow reps |
| Endurance And Posture | Easy lying leg raises with pauses | 2–3 sets of 12–15 reps |
| Sports Carryover | Hanging knee raises with light rotation | 3 sets of 8–10 reps per side |
This type of plan lets you start with simple flexion work, bring in more side-to-side moves, and step up the complexity only when your control improves. It also keeps weekly stress manageable so your trunk recovers between sessions.
Form Tips And Safety For Oblique-Focused Leg Raises
Good form matters more than load when the goal is healthy oblique training. Many people feel leg raises mainly in the hip flexors or lower back because the pelvis tips forward and the ribs flare away from the hips. The obliques switch off in that position, and the wrong tissue ends up carrying the load.
Keep Ribs And Pelvis Stacked
Before each set, pull the ribs gently down toward the hips and tuck the pelvis under a little so the belt line points slightly toward the face, not toward the floor. You do not need a hard crunch; a small, steady brace is enough. Hold that stacked position while you lift and lower the legs, and cut the range shorter if you feel your lower back start to arch.
Move Slowly And Control The Descent
Fast leg raises tend to use momentum and make it tough for the obliques to stay engaged. Lift the legs in two counts, pause briefly, then lower in three or four counts. The slow lowering phase is where the obliques and rectus abdominis work hardest to keep the pelvis stable.
Protect Your Lower Back And Hips
If you feel pinching in the front of the hips or sharp pressure in the lower back, change something right away. Options include bending the knees more, shortening the range, or moving from hanging versions back to lying versions until your core strength matches the demand. If pain continues or radiates, stop and talk to a healthcare professional before doing more.
Who Should Use Oblique-Focused Leg Raises
Oblique-focused leg raises suit many people who already have basic core control. They can help people who sit a lot and feel their trunks sag during the day, recreational lifters who want more stable squats and deadlifts, and athletes who cut, twist, or throw. Strong obliques help transfer force between the hips and shoulders and help keep the spine under control during daily tasks.
On the other hand, some people do better starting with less intense side-core work. If you have a history of lower-back pain, hernia repair, or abdominal surgery, medical advice tailored to your history comes first. Many will need to start with side planks, dead bugs, or other ground-based moves before adding loaded hanging work.
Once you can hold a steady plank, breathe well while bracing the trunk, and complete simple lying leg raises without pain or sway, oblique-driven leg raise variations become a useful next step.
Bottom Line On Leg Raises And Obliques
So if you still wonder, do leg raises work obliques?, think about how you perform them. Straight-line leg raises with solid form already ask the sides of your trunk to hold the pelvis steady. Angled, twisting, or side-to-side variations turn that support work into a strong training signal that can build strength and shape along your waist.
Use a mix of basic and oblique-heavy leg raises across the week, keep your ribs and pelvis stacked, and choose ranges and variations that let you move in a smooth, controlled way. Over time, that blend of precision and consistency will do more for your obliques than any single heroic set.