This is our go-to ab exercise since it works all four layers of the abdominal muscles.
- Sit on the ground and lean slightly back without rounding your spine at all. It is really important, and difficult, to keep your back straight, but don't let it curve.
- Pull your navel to your spine and twist to the left. Inhale through centre and rotate to the right.
- Keep twisting from side to side for 30 seconds.
Image Source: POPSUGAR Photography / Kyle Hartman