At first, the techniques required for the successful lifting of barbells does not look like life, sport or combat. But over time, all force application looks like powerful hip extension applied through a rigid torso (aka stable midline), and often completed via extension of an arm (or both arms). This description can be seen in running, jumping, punching, batting, golf-ball-punishing, throwing and in lifting lifting objects from the ground. Hip flexion adds to many movements, also, such as kipping pull-ups, maximal jumping, muscle ups, legless rope climbs, and etcetera.
Barbells provide a remarkable variety of ways to practice powerful hip extension while maintaining a rigid torso, which is why they are a potent tool for the development of human performance.