The physical exertion of caring and nursing personnel is a growing issue. The result of this is a ever larger group of employees of hospitals, nursing homes and caring institutions that have work related issues. More often than not this leads to personnel booking off sick. Moving a child or somebody of insubstantial weight around in a wheel chair is no big issue. The physical (over) exertion happens when moving heavy patients, moving wheel chairs on inclines or uneven terrain and when moving many people by wheel chair.