The amount of weight that you can lift on a workout bench depends entirely on the type of bench that you have purchased. For example, flat benches will allow you to lift more weight than incline benches because there is less strain on your body. Because of this, flat benches work well for heavier lifting while incline benches work better for lighter lifts. Adjustable benches can be used for all types of lifts as they allow you to adjust the angle and height of the bench.