Execution:
1
Lie on your back with knees bent and legs open in a butterfly position, soles of the feet together.
2
With your core braced, curl your torso up to a seated or nearly seated position.
3
Keep your arms reaching in front of your body throughout.
4
Lower your torso back down under control to the start.
Tip: avoid momentum — if you can't sit up without it, reduce the range.