1. Kneel on a mat and place your elbows under your shoulders, perpendicular to your body.
2. Extend your legs to the back with your forefeet on the mat, so that your head, body and heels are aligned in a straight line.
1. Engage your core and slowly twist your torso from side to side, with your feet as the pivot point.
1. Keep your back flat throughout the exercise.
This plank variation not only works your core and oblique muscles, but also helps train your body balancing. What seems hard today will one day be your warm-up.