"This gold medal," Shields said, "will make my life a lot better."
Truth is, she can thank herself for that.
"It took a lot for her to get to where she is, because she so easily could have gone in a different direction," said Mickey Rouse, who along with husband Jason Crutchfield, Shields' coach, has taken Shields in.
Unwilling to accept a life of poverty, crime or worse, Shields found her family, her passion and her way out through a small, dark basement gym.
"If you want something," she said, "you've got to get it yourself."
Now she is an Olympic champion, the only U.S. boxer — male or female — to leave London with a gold medal, with more possibly in store four years from now in Rio de Janeiro.
Her first fight since London is Thursday night at the National PAL Championships in Toledo, Ohio.
Shields is a fearsome presence in the ring. Her scowl and angry stare are the first signs of the trouble that awaits her opponents, and she removes any doubt with a furious flurry of punches. Her record is 29-1 — though she disputes that one loss — and she made easy work of the world's best fighters in her middleweight class at the London Olympics, capped by a 19-12 victory over Russia's Nadezda Torlopova, a former world champion at a higher weight class.
Outside the ring, however, she's no different than most 17-year-old girls. She spends hours texting and surfing the Internet on her computer, so much so that Crutchfield occasionally has to take her phone away. Her idea of celebrating when she got back from London was meeting friends at the mall, roller skating and having water balloon fights. No matter how hard she tries to keep it clean, her room is usually a mess.
She is meticulous about her appearance, often trying on three or four outfits before picking one. She's as at home in ballet flats as boxing shoes, and recently traded her braids for long, loose curls. She bites her nails — "I think it's a habit" — and plays with her hair when she talks, and she can't resist a quick glance to check herself out when she passes a mirror.
"Very typical kid," Crutchfield said. "Verrrrry typical."
Yet she just as easily could have been one of the many children who slip through the cracks in Flint.
Once the proud home of Buick, Flint has never recovered from the body blow it took when the auto industry collapsed in the late 1980s and early 1990s. The 2010 U.S. Census found nearly 37 percent of Flint residents living below the poverty level, more than double the national rate; the city had a median household income of just $27,199. The unemployment rate in August was 9.5 percent, more than a point above the national average, according to preliminary figures from the Bureau of Labor Statistics.
The East Side, where Shields spent most of her childhood and still trains, has been hit particularly hard. Miles of barren concrete and toxic contaminants are all that's left of Buick City, the vast assembly complex that employed almost 30,000 people at its height and dominated the landscape. Large portions of the surrounding neighborhoods are little more than rubble, blocks filled with burned-out or dilapidated houses. Liquor stores are plentiful, grocery stores not so much, and what few businesses there are barricade themselves behind thick, black bars on the doors and windows.
Drugs and gangs have flourished, and the city was the country's most dangerous for a second straight year in 2011, with 2,337 violent crimes per 100,000 residents, according to preliminary statistics from the FBI. With more than 50 murders already this year, the city is on pace to break its record of 66, set in 2010.
Shields knows the sad circumstances all too well.
Her older brother is in jail. She lost a friend to gun violence over the summer, and a man was shot and killed outside her training gym last month, less than an hour after she left. She didn't get to know her father, Clarence Shields, until she was 9 because he had spent the previous seven years in prison for breaking and entering, and his presence in her life remains sporadic. Her mother, Marcella Adams, does not stay in one place for long — there are nearly two dozen addresses listed for her — and the frequent moves meant Shields was always looking for a place to call home. There wasn't much money, either, and Shields said she often went hungry.
"It showed at the gym. I wouldn't have enough energy," she said. "I performed bad and I'd get super tired. I wouldn't be able to recover. I was in great shape, but you could just tell I wasn't eating."
While her younger siblings, Brianna Shields and Dusable Lewis, leaned on her, Shields learned early on that the only person she could rely on was herself. Even if that meant walking alone in the cold and dark so she could be at the gym by 6 a.m. to get a ride to a tournament.
"I didn't want to have to depend on nobody," she said. "So I would get up and walk."
Shields gravitated to boxing because of her father, whose own career as a fighter was derailed by his troubles with the law. He would tell her about Muhammad Ali and how his daughter, Laila, followed in his footsteps.
Shields decided she would do the same.
"Normally when kids have personal issues, they respond negatively," said Cheryl Adkins, principal at Northwestern High School, where Shields is a senior. "Claressa decided this was going to be her road and she stuck to it."
Shields was 11 when her father signed the permission slip for the boxing program at Flint's renowned Berston Field House. Crutchfield told her to join the other kids in front of the mirrored wall in the cramped basement gym to practice technique, then handed her off to one of the other coaches.
He didn't bother learning her name. He doubted she'd last long enough.
Two weeks in, however, Crutchfield noticed that Shields was catching on faster than the boys. And while she didn't say much, there was a fierce intensity to her.
"I saw how good she was doing and how fast she was advancing and then that's when I grabbed her," Crutchfield said. "I said, 'What's your name again?' She said, 'Claressa.' I said, 'Nah, from now on your name is Ress.'"
Crutchfield took Shields under his wing, teaching her the same punches, footwork and strategies that had won him four Golden Gloves titles in Michigan in the 1980s. She was a natural, and when women's boxing was added to the Olympic program in 2009, Crutchfield told Shields she could win the gold medal.
She was 14, not even old enough to qualify for the U.S. championships.
"I ain't never seen a woman who boxes like me. Even the girls who won gold medals," Shields said, proudly. "I think if I was another girl and I had to fight myself, I'd be biting my fingernails."
There is a brutal elegance to Shields' fighting style. Her fists fly with a smoothness, and she delivers her punches with a rhythmic POP! POP! POP! But the blows are punishing and come with unrelenting force, a power fueled partly by rage.
Shields talks matter-of-factly about her family and upbringing and the challenges they presented. She has made peace with all parts of her story, recognizing that while others may have provided the material, it is up to her to decide how it is written.