Don't fold the torso during sprinting... During upright sprinting, Coach Pfaff explains in this short clip how athletes should maintain a tall, stacked posture as the knee rises. Folding at the waist shifts pelvis position, changes force direction, and disrupts how the athlete applies force to the ground. Effective sprinting depends on posture control under dynamic conditions. When alignment stays organised, force application stays efficient. This is the Coaching Eye at work. Observe the posture

AA JFK BASED - WATCHING PAX GET IN HALF-RUNNING, HALF-SPRINTING POSITION WITH THEIR HEADS UNDER OVERHEAD BINS AS PLANE IS STILL TAXIING | Pam Ann