Oblique Crunch
How to Do the Oblique Crunch With Proper Form
Lie on your side with the hips stacked, knees bent comfortably, and the lower arm positioned to support the head without pulling on the neck.
Place the upper hand lightly behind the head or across the ribs and keep the top elbow relaxed.
Brace the trunk and keep the pelvis from rolling backward or forward.
Curl the upper rib cage toward the side of the pelvis using a controlled lateral bend.
Pause when the side of the trunk is shortened without forcing the shoulder toward the hip.
Lower slowly until the side body lengthens while keeping the hips stacked.
Complete the set, switch sides, and match the range and repetitions.
Form Check & Technique
DO THIS (Technique Tips)
- Keep the hips stacked throughout the set
- Think rib cage toward pelvis on the working side
- Use light head support only
- Pause at the shortened position
- Match sides by repetitions and range
AVOID THIS (Common Mistakes)
- Pulling the head toward the hip
- Rolling the pelvis instead of bending the trunk
- Using a fast bouncing rhythm
- Lifting the hips off the floor to create range
- Rotating forward instead of staying in a side bend
- Training one side with more volume than the other
About Oblique Crunch
The oblique crunch is a side-bending trunk exercise that emphasizes the internal and external obliques. Set up on your side or with one shoulder supported, then bring the rib cage toward the pelvis without yanking the neck or rotating through momentum. Use a range you can control and train both sides evenly.
Oblique Crunch Muscles Worked
The obliques create and control lateral trunk flexion while the deeper abdominal muscles help stabilize the torso.
- The quadratus lumborum and hip muscles may assist depending on the setup, but the movement should be led by a controlled rib-cage-to-pelvis curl rather than a hip hike.
Sets & Reps Guidance
Technique / Learning
2-3 sets of 8-12 bodyweight reps per side while learning to keep the hips stacked.
Strength Focus
3-4 sets of 8-12 controlled reps per side with a stable setup.
Muscle Growth (Hypertrophy)
2-4 sets of 10-20 reps per side with a slow return and brief top pause.
General training baseline. Need.fit automatically adjusts exact sets, reps, and working weight based on your individual fitness level, recovery, and progress over time.
Exercise Variations & Alternatives
side plank
cable woodchopper
dumbbell side bend
Russian Twist
Variation targeting Obliques, Abdominals
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Dumbbell Bench Press
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Side-Lying Oblique Crunch Setup
Stack the hips and keep the knees bent enough to make the position stable. The more the pelvis rolls or the feet push into the floor, the more the exercise can become a hip movement instead of a side crunch.
Oblique Crunch vs Side Plank
An oblique crunch trains active lateral flexion.
- A side plank trains the lateral trunk to resist that motion.
- They are different patterns and can be programmed together.
How to Avoid a Hip Hike
Keep the hips stacked and avoid lifting the pelvis toward the ribs. If the hips move more than the rib cage, reduce the range and slow the lowering phase.
How to Progress the Exercise
Build control and symmetrical repetitions first. Then add a light load, extend the pause, or use a longer lever position while keeping the same side-bending path.
Sources & References
- [1]
- [2]
- [3]ACSM Position Stand: Resistance Training Prescription for Muscle Function, Hypertrophy, and Physical Performance — PubMedView Source