#RunForBoston – Andrew Bunyard, 28, works at a hospital in Boston. "I refuse to forget what I witnessed and heard," he said.
#RunForBoston – Sharon Berger Cooper, 40, from Parkland, Florida, said the tragedy in Boston made her more grateful for her health and ability to run.
#RunForBoston – Lauren Germaine, 33, lives in North Carolina but calls Boston home. She hopes to run the marathon there next year.
#RunForBoston – Kylee Seibert, 27, from Bowling Green, Ohio, says she was inspired by "people running towards the scene" after the blasts in Boston.
#RunForBoston – Rosalind Cohen-Baruch, 44, from San Francisco, started running to lose weight and feel better about herself. She's running for people who have had that feeling taken away.
#RunForBoston – Cheering spectators are the only reason Ezra Gonzales-Müller, 35, from Germany, says he can finish a race. "I am devastated that they were targeted," she says. "My heart weeps."
#RunForBoston – Sean Houston, a CNN employee in Atlanta, says people who helped victims in Boston "remind us of the best of America."
#RunForBoston – "The bombings reminded me that I have a gift. I have my legs," says Catina Culshaw, 39, from Birdsboro, Pennsylvania.
#RunForBoston – Mark Giannetti, 23, lives near the site of the bombing. "I've been running every day to try and keep my mind clear," he says, "which doesn't quite work."
#RunForBoston – Jenifer Jagielski, 45, from Sydney, who broke her foot running, says the sport is great because it lets friends and family members share ups and downs together.
#RunForBoston – Deborah Kara, 26, who lives in Saudi Arabia, says Boston's victims "deserve our full support and cheering."
#RunForBoston – "I never thought I would say this, but I am going to run that marathon next year," said Karin Kenney, 45, of Massachusetts.
#RunForBoston – Texan Jennifer Kirkpatrick, 41, plans to run the Dallas Marathon.
#RunForBoston – Joseph Larramendia, 24, from New Jersey, wants to run to demonstrate how "strong and resilient" Americans are.
#RunForBoston – Beatriz Orozco, 28, from California, likes running for its sense of community -- and because she only has to compete with herself.
#RunForBoston – "I'd like to show marathon runners and those watching that I'm inspired by so many of them," said Jessica Pilkington, a 27-year-old who works in Boston.
#RunForBoston – Mishka Shubaly, from New York, has used running as a way work through his alcohol addiction.
#RunForBoston – "I was left with a surprising anger" after the bombings, said Valerie Szwarc, 47. She wants to qualify for the Boston Marathon to show "good will always outweigh evil."
#RunForBoston – Chris Gorman, 31, is raising money for charity while he runs with Boston in mind.
#RunForBoston – After watching the "completely unreal" events unfold in Boston, New York resident and Boston native Jainen Thayer decided to run "to begin to heal."
#RunForBoston – Jenny Van Buren, 43, from Ohio, said the Boston bombing only "makes me want to run farther!"
#RunForBoston – "I run for the support, the spectators and the victims of Boston," said Jennifer Wood, 34, from Syracuse, New York.
#RunForBoston – "As runners, we are resilient by nature," said Megan Biller, a 29-year-old in Big Rapids, Michigan.
#RunForBoston – Victoria Bushmire, a 29-year-old in Pittsburgh, says runners all over the world feel Boston's pain.
#RunForBoston – Katherine Lee, a 52-year-old from Missouri, and her daughter have been to the Boston Marathon before. They're running with Boston "on our minds and in our hearts."