5. Russian Twist Exercise

Sit on the floor with your knees bent and your feet flat on the ground. Lean back so your torso is at a 45-degree angle to floor, making sure to keep the spine straight and not rounded.

Lace your arms straight out in front of your chest with one hand on top of the other.Raise your core and slowly rotate round to the right as far as you can, pause then reverse this movement all the way round to the left as far as you can.