Tiki Barber explains comebackFormer New York Giants running back Tiki Barber talks about why he's attempting a comeback to the NFL after four years of retirement. (Read moreSI Staff|Share on FacebookShare on XAdd us on Former New York Giants running back Tiki Barber talks about why he's attempting a comeback to the NFL after four years of retirement. (Read more at SI.com/magazine)Published May 23, 2011 | Modified May 23, 2011SI STAFFShare on FacebookShare on XHome/NFL