1. Rolling Thunder:
- Lie on your back and hold a kettlebell in each hand by your chest.
- Straighten one arm and push upwards so your shoulder leaves the floor and you twist your torso.
- As you lower that kettlebell, extend the other arm to create a smooth rhythm.
Lying on the floor reduces the instability, and therefore the risk, of the exercise. I get people to think about imprinting their lower back on the floor. That will help you to avoid overarching your lower back and switching off your abdominal muscles.