The trunk is your power hub—the central connection point where leg drive meets upper body rotation. When your core positioning is off, even by a few degrees, energy hemorrhages out of every stroke. A stable core means efficient power transfer, reduced injury risk, and the ability to maintain technique when fatigue sets in. In this episode, Ivan Lawler demonstrates the exact trunk position that keeps endurance athletes fast for hours on end. It’s not about rigid stiffness—it’s about controlled, dynamic stability.