GymTime - Seated Russian Twist Sit on the ground with your knees bent and your heels about a foot from your bum. Lean slightly back without rounding your spine at all. It
Russian Twist Variations | POPSUGAR Fitness
How to Avoid the Worst Russian Twist Form Mistakes | livestrong
Dumbbell Russian Twist by Ilpesante Alex - Exercise How-to - Skimble