Pilates
Pilates Chair Jackknife
The Pilates Chair Jackknife uses a supported inversion to train abdominal control. In this floor-based version, you hold the chair pedal while lifting and lowering your pelvis and legs.
Higher injury risk. Read the safety notes before adding weight.
- Advanced
- Compound
- Higher injury risk
- Rest 1 min
How to do it
- Lie on your back with your head toward the chair, close enough to reach the pedal overhead.
- Press the pedal down with both palms, keeping your arms long.
- Extend your legs toward the ceiling.
- Roll your pelvis off the floor, bringing your legs overhead.
- Raise your feet toward the ceiling with your weight supported across your shoulders and upper back.
- Roll your spine back onto the floor gradually, with your legs pointing upward.
- Return your feet to the floor with bent knees after your final repetition.
- Release the pedal slowly.
Form cues
- Exhale into the lift.
- Keep your ribs drawn inward.
- Reach through your toes without gripping.
Common mistakes
- Swinging into the inversionReduce the lift until you can raise your pelvis without throwing your legs overhead.
- Twisting during the liftKeep both sides of your pelvis level as your legs travel.
Safety
Rolling too far or losing control can shift pressure onto your neck. An unstable chair or uncontrolled spring-loaded pedal can cause a fall, impact, or finger injury.
- Learn this version with qualified, hands-on Pilates instruction and direct spotting.
- Have the spring setting and pedal travel selected for this exercise before starting.
- Check that the chair is stable, springs are secure, and your head and fingers are clear of moving parts.
- Keep your head still throughout the inversion; end the set if you feel neck pressure or cannot control the pedal.
If you have neck or back problems, osteoporosis, or medical advice to avoid inversions, get clearance from a physiotherapist or doctor before attempting this exercise.
Muscles worked
Primary muscles
Secondary muscles
Equipment
- Pilates Chair
Sets and reps
- Sets
- 1–2
- Target
- 3–5 reps
- Rest
- 1 min
Use this low-volume starting range only after you can perform the movement safely under supervision.