Crunch (legs on stability ball)
Expert Advice
Keep the ball stable by engaging your core and glutes throughout the movement.
How-to-do Steps
- Lie on your back with your calves resting on a stability ball.
- Place your hands behind your head or across your chest.
- Perform a crunch by lifting your shoulder blades off the floor.
- Lower back down with control.
- Repeat for the desired number of repetitions.
Track Crunch (legs on stability ball) 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
Crunch (legs on stability ball) primarily targets the Abs, with Strength mechanics using Stability Ball. Understanding muscle activation patterns helps you focus on proper engagement and maximize training effectiveness.
Primary

Abs100%
Equipment
Stability Ball

Exercise Type
Strength
Sets & Reps Guidance
Beginner3 x 12-15
Intermediate3 x 10-12
Advanced4 x 8-10
Frequently Asked Questions
What muscles does Crunch (legs on stability ball) work?
Crunch (legs on stability ball) primarily targets the Abs. It is classified as a Strength exercise performed with Stability Ball.
How many sets and reps should I do for Crunch (legs on stability ball)?
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 Crunch (legs on stability ball) suitable for beginners?
Yes, Crunch (legs on stability ball) is rated as a beginner-friendly exercise, making it an excellent starting point. Focus on mastering proper form before increasing intensity or load.