He qualified for the Boston Marathon while running in prison. Now, he's a free man with bigger go…

To the outside world, Markelle Taylor was an inmate. But behind the walls at San Quentin State Prison, he had a different reputation — the fastest athlete with unmatched grit. Now, he's racing on the world's biggest stages as a free man and making strides toward a better life. As part of the "CBS Mornings" series "Pushing the Limits," our lead national correspondent David Begnaud joined Taylor as he trains for his next race and overcomes obstacles along the way.

Each weekday morning, "CBS Mornings” co-hosts Gayle King, Tony Dokoupil and Nate Burleson bring you the latest breaking news, smart conversation and in-depth feature reporting. "CBS Mornings" airs weekdays at 7 a.m. on CBS and stream it at 8 a.m. ET on the CBS News app.

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