Standing oblique crunch
Also called standing side crunch.
What is a standing oblique crunch?
A standing oblique crunch is a bodyweight exercise that brings one knee toward the elbow on the same side while you bend your torso sideways. This guide covers the side crunch, with the knee lifting out to the side rather than crossing toward the opposite elbow.
How do you perform a standing oblique crunch?
Set up
- Stand with your feet about hip-width apart and your knees soft. Leave room beside you to lift a knee outward.
- Rest your fingertips lightly at your temples with your elbows comfortably open. Shift your weight onto your left foot and start tall.
Execution
- Lift your right knee out to the side as you bend your torso to the right, bringing your right elbow and knee toward one another.
- Stop where you can keep your balance without hopping or pulling your head down. Your elbow and knee do not have to touch.
- Lower your right foot to the floor and straighten your torso under control before starting the next rep.
- Complete your planned reps, then switch sides and repeat with the same setup.
Common mistakes
Bringing the knee across the body
Moving toward the opposite elbow turns the rep into a cross-body crunch. Keep the working knee and elbow on the same side for this version.
Pulling the head down
Your hands mark the arm position; they do not drag your neck toward the knee. Keep a light touch and shorten the rep if you need to pull.
Lifting the knee while keeping the torso upright
A knee lift alone misses the sideways crunch. Use a smaller knee lift and add a controlled bend through the torso.
Where it fits in a session
Use it in a bodyweight core session. Count one knee lift and return as one rep for that side.
Choose a rep target you can repeat without hopping or rushing. If balance limits the set, use light hand support before adding more reps.
Muscles worked
Primary
Secondary
- None listed in this guide
Schematic surface view. Some muscles are partly visible or not shown.
The obliques contribute to the sideways bend of the torso.
Variations
- Supported standing oblique crunch — Rest the free hand on a stable chair or wall and keep the working hand at the temple. Use a smaller range if needed.
- CrunchPerformed lying on your back, bringing the shoulders toward the pelvis without a standing knee lift.
Frequently asked questions
What muscles do standing oblique crunches work?
The target is the internal and external obliques at the sides of your abdomen. They contribute to sideways bending of the torso.
Which elbow should the knee move toward?
The elbow on the same side. A right knee lift pairs with a right sideways crunch. Bringing the right knee toward the left elbow is a cross-body version with a different movement pattern.
Do my elbow and knee have to touch?
No. Bring them closer only as far as you can keep the standing foot planted and lower under control. Trying to force contact often turns the rep into a hop or a pull on the head.
What if I keep losing my balance?
Put your free hand against a wall or a stable chair and reduce the height of the knee lift. Reset with both feet on the floor between reps. The support is there to help you practice a controlled sideways crunch.
Is this the same as a floor oblique crunch or a side bend?
No. A floor oblique crunch is performed lying down. A standing side bend keeps both feet down and may use an external weight. This version combines a sideways crunch with a knee lift on the same side.
Sources
- Flynn W and Vickerton P (2023). Anatomy, Abdomen and Pelvis: Abdominal Wall. StatPearls. Updated July 24. https://www.ncbi.nlm.nih.gov/sites/books/NBK551649/