Trunk Flexion · Bodyweight / mat or machine
Crunch
Primary muscles: Abdominals
Exercise data by RepDB (repdb.co)
Setup
- Lie on your back with knees bent and feet supported.
- Place hands where they do not pull on the neck.
- Set the ribs over the pelvis before beginning.
How To Perform It
- Curl the upper trunk by bringing the ribs toward the pelvis.
- Pause briefly at the top.
- Lower slowly until the shoulder blades return toward the floor.
Key ASF Cue
“Curl the ribs toward the pelvis - do not pull your head forward.”
Common Mistakes
- Pulling on the neck.
- Using momentum.
- Turning the movement into a full sit-up when that is not prescribed.
Safety Note
Stop if the movement aggravates the neck or back; choose another core option.