The crossed arm crunch is a beginner friendly bodyweight crunch exercise that works your abdominals. This is a safer version of the crunch as it is easier to perform and safer for your neck.
Step 1. Lie on your back with your knees bent up and your arms crossed over your chest. Press your back in to the floor and engage your core.
Step 2. Lift your head, shoulders and upper back off the floor and exhale as you lift.