Sunita, 41, an accomplished marathoner, will be running as fast as eight mph during the 42.16 kilometres simulated run, restrained to the treadmill in a harness so she wouldn't float away.
Indian-American astronaut Sunita Williams, who plans to run the 26.2 mile Boston Marathon on board the International Space Station on April 16, finds it a challenging exercise.
NASA officials are now looking at ways to make her stay in space easier, given the additional physical and psychological pressures.
Sunita and Commander Michael Lopez-Alegria completed the last of the internal assembly tasks for the startup later this year of the new Oxygen Generation System in the Destiny laboratory.
The power drop led to a temporary loss of ISS communications and the shutdown of heating units, some science equipment and one of three operating US gyroscopes used for attitude control.
This spacewalk marked the 80th EVA dedicated to the ISS assembly or maintenance, and push total spacewalking time outside the orbital laboratory past the 490-hour mark at full duration.
Total spacewalking time for Sunday's walk was 7 hours, 11 minutes. And, now they are all set to enjoy the spectacular Super Bowl football game between the Chicago Bears and the Indianapolis Colts.
The 15-minute conversation, which took place on Friday, was broadcast on National Aeronautics and Space Agency Television, following the conclusion of a station status media briefing from NASA's Johnson Space Center in Houston.
The International Space Station orbits the earth 16 times in a day.
Sunita, who arrived at the station with the STS-116 mission, replaced European Space Agency Astronaut Thomas Reiter on the Expedition 14 crew at midnight on December 12.
Sunita replaced German astronaut Thomas Reiter on the ISS, who will return to earth after a five-month sojourn in space.
Despite doubts about the take-off due to poor weather forecast and a two-hour delay before tanking operations, Discovery and its crew of seven lifted off from the Kennedy Space Center in Houston at 7:17 am IST.
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