Stand on the floor with your legs and torso balanced so that you are only supported by your buttocks and with the kettlebell in your hands, twist from side to side. Perform this movement in a controlled manner and with a weight that you can easily handle as it is a position that can be compromised for the back.
legs, calves, femoral, quadriceps
legs, buttocks, calves, femoral, quadriceps
shoulders, triceps, chest