Many training chairs have the added advantage of being stackable. This is a great space - saving feature, especially when the chairs are not in use. Stackable chairs can be neatly piled up against a wall or stored in a closet, freeing up valuable floor space in the training room. The design of the chair allows for stable stacking, with features like recessed armrests (if present) or specially - shaped backs to ensure that the chairs don't tip over when stacked.