Side-Lying Knee Tuck Oblique Crunch
Easy
Expert Advice
Your elbow and knee do not need to touch. Aim to shorten the distance between your upper ribs and hip rather than chasing contact.
How-to-do Steps
- Lie on your side, slightly reclined, with your lower hip resting on the floor.
- Brace your torso with your lower arm and keep your lower leg extended.
- Place your upper hand behind your head, keeping your neck relaxed.
- Exhale as you tuck your upper knee toward your upper elbow and curl sideways.
- Slowly extend your upper leg and lower your torso back to the starting position.
- Complete the prescribed reps on one side, then switch sides and repeat.
Common Mistakes
- Pulling your head forwardFix: let your hand support your head without tugging.
- Swinging the upper legFix: slow the tuck so your waist leads the movement.
Coach Cues
Lower leg stays longCurl through your waistLengthen back out slowly
Short reminders to keep in mind during every set.
Track Side-Lying Knee Tuck Oblique Crunch in FitAI
Log your sets, reps, and weights automatically. Get AI-powered progressive overload recommendations and form feedback — personalized to your training history.
Muscles Worked
Side-Lying Knee Tuck Oblique Crunch primarily targets the Abs, with Strength mechanics using Body Weight. Understanding muscle activation patterns helps you focus on proper engagement and maximize training effectiveness.
Primary

Abs80%
Secondary

Quads20%
Equipment
Body Weight

Exercise Type
Strength
Why Level 2?
Easy
Coordinating the knee tuck with a lateral curl requires basic control despite floor support.
Technique
Stability
Strength
Mobility
Impact
Learning
Sets & Reps Guidance
Beginner3 x 12-15
Intermediate3 x 10-12
Advanced4 x 8-10
Variations
Easier Variation
Harder Variation
Frequently Asked Questions
What muscles does Side-Lying Knee Tuck Oblique Crunch work?
Side-Lying Knee Tuck Oblique Crunch primarily targets the Abs. Secondary muscles involved include Quads. It is classified as a Strength exercise performed with Body Weight.
How many sets and reps should I do for Side-Lying Knee Tuck Oblique Crunch?
For beginners, start with 3 sets of 12-15. Intermediate lifters can do 3 sets of 10-12. Advanced athletes can push to 4 sets of 8-10. Adjust based on your goals and recovery capacity.
Is Side-Lying Knee Tuck Oblique Crunch suitable for beginners?
Yes, Side-Lying Knee Tuck Oblique Crunch is rated as a beginner-friendly exercise, making it an excellent starting point. Focus on mastering proper form before increasing intensity or load.
What are the most common mistakes when doing Side-Lying Knee Tuck Oblique Crunch?
Pulling your head forward: let your hand support your head without tugging. Swinging the upper leg: slow the tuck so your waist leads the movement.