Side Bridge with Bent Leg
- Target muscle
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- Equipment
- Body weight
- Body part
- Hips
- Type
- Strength
The side bridge with bent leg is a beginner-friendly lateral core exercise performed lying on your side with the bottom knee bent and resting on the floor for added support. It challenges the obliques and hip stabilizers as you hold your torso and hips in a straight line against gravity. The bent-knee position reduces the load compared to a full side plank, making it a practical starting point for building lateral core stability.
How to do the Side Bridge with Bent Leg
- 1Lie on your side on a mat with your bottom knee bent to roughly 90° and your top leg extended straight, feet stacked or the top foot placed slightly in front.
- 2Position your bottom forearm on the mat directly below your shoulder, elbow bent at 90°, with your forearm pointing forward.
- 3Keep your top hand resting on your hip or extended toward the ceiling — whichever helps you maintain balance.
- 4Brace your core gently and exhale as you lift your hips off the mat until your body forms a straight line from your head through your top heel.
- 5Hold this position with your hips level — neither sagging toward the floor nor hiking upward.
- 6Keep your neck neutral and your gaze forward rather than down at the mat.
- 7Hold for the target duration, breathing steadily, then lower your hips back to the mat with control.
- 8Complete all reps on one side before switching to the other.
Form tips
- Stack your bottom shoulder directly over your elbow to keep the joint in a stable, aligned position.
- Squeeze the muscles along the side of your torso throughout the hold — passive hanging in the position reduces the training effect.
- If your hip sags after a few seconds, end the set rather than grinding through poor form.
- Progress hold time gradually — adding 5 seconds per session is sufficient before advancing to a full side plank.
Common mistakes
- Letting the hips sag toward the floor, which reduces lateral core engagement and places extra stress on the lower back.
- Rotating the torso backward so the chest opens toward the ceiling, turning the exercise into something closer to a back extension than a lateral hold.
- Placing the supporting elbow too far in front of or behind the shoulder, which makes the position unstable and harder to maintain.
- Holding your breath, which increases internal pressure unnecessarily and makes the hold harder than it needs to be.
- Rushing through the set to hit a target time — shortening the hold or losing alignment defeats the purpose of the exercise.
Frequently asked questions
What is the difference between a side bridge with bent leg and a regular side plank?
In the bent-leg version, the bottom knee stays on the floor, shortening your lever arm and reducing the load on the lateral core. A full side plank has both legs straight, which demands more from the obliques and hip stabilizers. The bent-leg variation is a useful starting point if you cannot hold a full side plank with good form.
What muscles does the side bridge with bent leg work?
It primarily challenges the obliques and the hip stabilizers on the working side, which must contract to prevent the hips from dropping. The shoulder stabilizers of the supporting arm also work to hold the position.
How long should I hold the side bridge with bent leg?
Beginners often start with holds of 10–20 seconds per side and build toward 30–45 seconds before progressing to a full side plank. Prioritize form over duration.
Can I do this exercise every day?
Short isometric holds at moderate intensity can be trained daily for most people, but two to four sessions per week with adequate rest is a sustainable and effective approach for general core conditioning.
When should I progress from the bent-leg side bridge to the full side plank?
Once you can hold the bent-leg version for 30–45 seconds per side with steady breathing and no hip sag for multiple sets, you have a solid foundation to attempt the full side plank.
