The Multi Flight Machine has many advantages over dumbbells, making training for the shoulders, chest and back more effective in building muscle while reducing risk to the joints. This is because the resistance of the machine is oriented laterally, which is exactly what is needed to properly train the deltoid muscles. In order to work this muscle with shoulder raises, the resistance must come from the sides, not downwards like with dumbbells.Multi Flight Machine provides a proper match between muscle strength and machine resistance, which dumbbells do not. The constant resistance provided by the Multi Flight contrasts with the very erratic resistance of dumbbells. It prevents the excessive cheating we often see with free weight training.