A weight lifting bench is one of the most common pieces of home gym equipment. The design of the specific bench will vary according to the general purpose of the equipment. The most basic benches are utility benches. They are usually just a padded board on a waist high framework. The framework must be solid with welds free of snags, cracks or thin spots.
The more elaborate benches will be flat, but they also will sometimes have an adjustment so that one portion of your bench can be adjusted up or down while the other portion remains horizontal. This type of weight bench will have a different framework underneath so that there will be adequate support to the flat portion of a bench. As well as a strong framework with a rust and moisture resistant frame, the bench must be padded to prevent rubbing of bones of your shoulders or spine against the framework.
The frame might be u-shaped, especially if there is a frame for holding the weights at the head of a bench. Occasionally the frame will be a simple I-shape or rectangle. Where there is a frame for the barbells, the footing might be a t-shape. In either case, the stability of a footing is critical to safety and convenience. A wide stance will prevent tips and sliding.
At the same time as there is stability considerations to be incorporated into the design, the engineering must allow for comfort of any person reclining or sitting on the frame. If there is a spotter used for safety, he or she must be able to stand to reach the equipment without interfering with the movement of a weight lifter or the equipment that is being lifted.
The next step up in weight lifting equipment is a flat bench with the option to use the incline or decline feature. Multiple adjustments allow for working the abdominal muscles as well as the arms, chest and shoulders. Upper arms and forearms can be worked individually or as part of a more extensive muscle group.
The incline, decline and flat weight lifting bench with a dumbbell style is slightly different in the framework. The bench is narrower and the extra width is at the head of the bench rather than at the foot. Again, the stability is critical while the user is using small dumbbells. There is no danger of tipping, walking or sliding thanks to the wide stance and solid frame.