Ab Crunch Machine is a isolation spinal flexion exercise for the core. Use a controlled range that keeps the target muscles loaded and the joints comfortable.
Start
Finish
Set up
1Adjust the seat and pads before loading the working weight.
2Match the machine pivot to the joint being trained whenever a pivot marker is present.
3Set the pelvis and ribcage so the abdominals can shorten without hip momentum.
4Choose a load that allows a smooth curl through the trunk.
How to perform it
1Exhale and draw the ribs toward the pelvis.
2Pause in the shortened position without pulling on the neck.
3Return slowly until the abdominals are lengthened.
4Reset the brace before the next rep.
Breathing
Exhale through the effort or shortened position; inhale during the controlled return. Keep the trunk quietly braced.
Technique cues
•Ribs toward belt buckle
•Curl; do not just hinge
•Exhale fully at the finish
Common mistakes
•Pulling with the arms or neck
•Moving only at the hips
•Rushing the return
Machine busy?
See equivalent alternatives
These options train the same main muscle group and prioritize a similar movement pattern. Match the effort and rep target rather than trying to match the exact load.
Safety note: This training reference is educational, not medical advice. Use pain-free ranges and seek qualified care for persistent pain, dizziness, or other concerning symptoms.
