Team USA women secure 4x400m relay SWEEP for Americans at World Indoor Championships | NBC Sports

Rosie Effiong dug deep on the second leg of the 4x400m relay to move Team USA into a first place position that they never relinquished, winning a second straight 4x400m relay on the heels of the men doing the same. #NBCSports #TrackandField #WorldIndoorChampionships #TeamUSA #Relay » Subscribe to NBC Sports: https://www.youtube.com/nbcsports?sub_confirmation=1 » Watch Live Sports on Peacock: https://peacocktv.smart.l...