When you lead with your hands you will immediately take all the power away from your core. All the pressure is on your upper body now as opposed to if you lead with your hips, all the power is still in your hips and it’s generating to the ball. When you go with your hands, it can only be a split second delay, but that’s enough to switch off the power in your core and force it go into your upper body and you will lose bat speed.

Basic Training Tips, Related to 20 Minute Challenge