- Holding a dumbbell or medicine ball in both hands, sit on the ground with your knees bent and your heels about a foot from your butt. Lift your feet 10 to 20 centimetres off the floor.
- Lean slightly back without rounding your spine at all. It is really important, and difficult, to keep your back straight.
- Pull your navel to your spine, and twist slowly to the left, bringing the weight to your left side. The movement is not large and comes from the ribs rotating, not from your arms swinging. Inhale through centre, and rotate to the right. This completes one rep.
If you have a partner, sit side-by-side and toss the medicine ball back and forth.
Image Source: POPSUGAR Photography / Rima Brindamour