Machine Ab Coaster Crunch
Kneeling on the Ab Coaster's carriage, curl the knees up the curved rail toward the chest; the pelvis rolls under, as in a reverse crunch.
How to do it
Setup
Knees on the carriage pad, shins flat, hands on the handles, arms straight, torso leaning forward.
Steps
- Curl the pelvis under and drive the knees up the rail.
- Squeeze the abs at the top for a beat.
- Let the carriage roll back down under control.
Common mistakes
Swinging the carriage with momentum: pause at the bottom, then curl. Pulling with the arms: they hold the handles straight. Letting the carriage crash down: the lowering is half the rep.
Breathing
Exhale on the tuck, inhale extending.
