The Movin' Sit' & Moving' Sit Jr. are inflatable dynamic air cushions which activate instrinsic trunk muscles to support the spine. The wedge shape encouarges a seated posture with a forward pelvic position and the movement makes the user feel off balance if not sitting correctly. The wedge encourages 'active sitting' as the user is required to activate muscles to remain stable due to the unpredictable base of support thus improving concentration. By pushing the user's pelvic muscles forward, stress on the lower back is reduced and slouching is prevented, therefore improving posture.