here is the challenge, 30 rubles or 30 squats? that's a dollar by the way. a fun experiment meant to get people excited about the winter olympics in russia. people riding moscow's metro asked to do squats s instead of pay for the ride, if they could do it. phil black tried. >> reporter: beneath the freezing streets of moscow the city's underground train system, the metro. it was a source of great pride to the soviet union, some of its stations and platforms are spectacular. this is a recent attempt to bill national pride with the metro. these people are buying tickets with the winter olympics coming to the city of sochi next february, the government wants people to get excited and get moving. instead of accepting 30 rubles for a ride, about one dollar, this machine allows people to pay with 30 squats. we saw lots of enthusiasm.