Physical Trainer, Brian Hancock, demonstrates the starting position for the Sprinter Start exercise on April 4, 2013, at the Barber Physical Activity Center aboard Marine Corps Base Quantico. This exercise can help improve run times. - Physical Trainer, Brian Hancock, demonstrates the starting position for the Sprinter Start exercise on April 4, 2013, at the Barber Physical Activity Center aboard Marine Corps Base Quantico. This exercise can help improve run times.