Are you looking to improve your power and explosiveness? The trap bar jump that Coach Sullivan is demonstrating is one way you can train it.
Training an explosive movement with weight promotes motor unit recruitment within the muscles. This means that the muscle can work faster and more powerful, closer to its maximum potential, when activated.
Pairing this exercise with a heavy deadlift or squat variation before, along with an unloaded power or speed movement after is also one way to maximize muscle recruitment, known as post-activation potentiation.