On the fundamentals video, Charlie has the sprinters lead hand the same side as the lead leg. For instance, one leads with the right hand if the right leg is lead leg. Does it matter that much if the left hand is lead hand in this case? When in the sprint, the runner leads with the opposite hand. Would leading with the same hand as the lead leg in the start, a transition would be required to “switch” hands as it were.
umm when you exit the blocks with, for example, your right leg as your lead leg, the first leg exiting is the left leg and it would make sense then for the right arm to come up. try it the other way and you will see yourself fumble.