An inmate serving a mandatory minimum sentence of one year or more, who is approved to participate in the work release program, shall serve the final six months of the inmate’s mandatory minimum sentence performing labor in the program. Duties, if possible, shall consist of physical labor in plain view of the public. However, an inmate shall not be required to perform work which is beyond an inmate’s physical ability, which constitutes a physical hardship, or which is dangerous or threatening to the inmate’s life or health, medically prohibited, or unduly painful.