The stimulation pulse delivered by Slendertone using the patented three gel pad arrangement is symmetric on both sides of the abdominals meaning the muscles on both your right and left-hand side are getting the same workout (provided both sides are turned up to the same intensity of course).
Some users may experience perceptual differences in the sensation of the training, most likely due to a slight variance in the positioning of the belt on the right or left side of the stomach. This minor difference might cause the user to be slightly closer to the motor point (point where a nerve innervates a muscle) on one side and subsequently get a different sensation. However, the workout provided is equal on both sides. In the event of a slightly different sensation, the user should pause the product and readjust the positioning slightly to see does this correct any discrepancies in sensation.