 While for some individuals, stability of the seating surfaces may be necessary for certain functions (such as while using a communication device or for self-feeding) it is becoming increasingly recognized in the field that movement while seated during other hours of the day is of value and benefit for health and function.An active seating system is dynamic, to enable the child to be properly positioned during and after moving while seated, promoting their overall function — and also dynamic enough to help prevent painful and damaging shear and the prolonged adverse pressure of immobility.Hypotonia is low muscle tone, resulting in an inability to sustain controlled movement of the body against gravity, and can often manifest as poor trunk control.