A plank leg raise is a core exercise that combines a forearm or high plank with one-leg lifts to challenge your abs, glutes, shoulders, and hip stabilizers at the same time. It looks simple, but the real work is resisting rotation and keeping your torso steady while one leg moves.
Done well, it can help improve core control, pelvic stability, and balance. Done poorly, it can turn into a low-back exercise instead of a core exercise, so form matters more than height or speed.
How to do a plank leg raise
Start in a forearm plank or high plank with your hands under your shoulders, or elbows under shoulders if you prefer the forearm version. Brace your core, squeeze your glutes, and keep your body in a straight line from head to heels.
Slowly lift one leg a few inches off the floor without letting your hips twist or your lower back arch. Pause briefly, then lower with control and repeat on the other side. The movement should be small and deliberate; if you need to kick the leg high to feel it, the position is probably too unstable.
If your hips sag, your ribs flare, or your neck cranes forward, reset. Quality reps build strength and control better than fast reps.
What muscles work in a plank leg raise
The plank leg raise is a full-core stability exercise, not just an ab move. Your rectus abdominis, obliques, transverse abdominis, glutes, shoulders, and deep hip stabilizers all have to work to keep the body from shifting.
The glute of the lifting leg helps extend the hip, while the standing side of the core works hard to prevent rotation. That anti-rotation demand is one reason this variation feels tougher than a standard plank.
For people who sit a lot or feel weak in single-leg stability tasks, plank leg raises can be a useful bridge between basic planks and more advanced core training.
Common form mistakes and how to fix them
The most common mistake is letting the lower back take over. If you arch your back while lifting the leg, reduce the range of motion and focus on a harder glute squeeze before each lift.
Another issue is hip rocking. Keep your feet about hip-width apart at first, press the floor away, and imagine balancing a glass of water on your low back. If the hips still sway, shorten the hold or switch to fewer reps per side.
People also rush the movement. A controlled 2- to 3-second lift and lower is usually more effective than fast reps. If you use phone-based workout tracking, Fitnit can help with form analysis and rep counting so you can spot sloppy reps during at-home sessions.
Progressions, regressions, and programming
If a full plank leg raise is too difficult, start with a regular plank, then add toe taps or alternating leg lifts from a shorter plank hold. You can also do the movement from your knees to learn the pattern with less load.
If it feels easy, increase the challenge by slowing the tempo, adding a pause at the top, or lifting from a forearm plank with feet closer together. Avoid turning it into a back-bending movement; more height is not better.
For general fitness, 2 to 4 sets of 6 to 12 controlled reps per side is a reasonable place to start, depending on your level. Stop a set when your torso stops staying quiet.
Tips
- Brace your abs before each lift, as if preparing for a light punch.
- Keep the lift small; the goal is stability, not maximum leg height.
- Squeeze the glute of the moving leg to help protect the low back.
- If your shoulders fatigue first, try a forearm plank version.
- Match the exercise to your current control level instead of forcing advanced reps.
Sources
- Plank Exercise: How to Do It, Benefits, and Variations — ACE Fitness
- Exercise: 7 benefits of regular physical activity — Mayo Clinic
- Core training for performance and injury prevention — PubMed
- Physical Activity Guidelines for Americans — U.S. Department of Health and Human Services
Frequently Asked Questions
Is a plank leg raise good for abs?
Yes. It trains the abs, especially the deep core, by forcing them to resist rotation and keep the torso steady.
Should I do plank leg raises every day?
Not necessarily. Like other strength exercises, they work best as part of a balanced routine with recovery time.
Why do I feel plank leg raises in my lower back?
Usually because the core is not braced enough or the leg is being lifted too high. Reduce the range and tighten your glutes.
Are forearm or high plank leg raises better?
Neither is universally better. Forearm planks often reduce wrist strain, while high planks can feel more natural for some people.
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