Backtivator Seat Cushion.
By Backtivator features two small, carefully optimized air-filled compartments to ensure that even while sitting, your spine is moving. A subtle transfer of air between the Backtivator compartments creates an unnoticeable movement of your spine. It requires no power source, but instead relies on your own body energy to create the spinal motion. With continuous use your back gets and stays healthy...and ultimately you feel great!