A crunch that brings one elbow across the body to the opposite knee as that knee draws in. The rotation adds oblique work to the curl.
Primary muscles
Secondary muscles
This information is general fitness guidance, not medical advice. Stop if you feel pain and consult a qualified professional.
Main muscles working (thicker lines)
Lie on your back with knees bent, feet flat and fingertips lightly behind your head.
Brace your abs and press your lower back toward the floor.
Curl up and rotate to bring your right shoulder and elbow toward your left knee as you lift that knee in.
Touch or get as close as you can, then lower back to the start.
Repeat to the other side and keep alternating.
Breathing: Exhale as you crunch across, inhale as you lower.
Lead with the shoulder, not the elbow
Knee and elbow meet in the middle
Lower all the way between sides
Yanking the head with the hands
Only moving the elbow instead of rotating
Rushing into a bicycle rhythm
Keep your hands light on your head to protect the neck.