Some people spend years training for the Boston Marathon. Dr. Jason Reynolds of Marion only has six months until he hits Heartbreak Hill for charity.

A first time marathoner (Boston or otherwise), Reynolds is running for the Boston Children’s Hospital, which offers a range of services for patients up to 21 years old.

Reynolds, now a pediatrician at Wareham Pediatrics, has a connection with the hospital, having spent 10 years on its medical staff.

“It’s a huge honor to be able to raise money for the Children’s Hospital,” said Reynolds. “I have a great amount of respect for the physicians there, as well as the innovations and research they’ve done to improve children’s health.”

Reynolds was tapped to join the Boston Children’s Miles for Miracles Team in October just 10 months after he took up running at the age of 47.

While he started running for his health, Reynolds said participating in the New Bedford Half Marathon he had added motivation. His father-in-law had fallen ill and Reynolds used the race as an opportunity to raise awareness and funds for those undergoing liver transplants through the UMass Memorial Transplant program.

He discovered that running and raising funds suited him well.

“I’m not just running to improve my distance or my time,” said Reynolds. “I’m running to support a cause. That’s more meaningful to me.”

There are two ways to qualify for the Boston Marathon. Runners either must meet a qualifying time or apply for one of many spots provided to charitable groups.

After his success in raising $3,000 with his kids for the transplant program and another $1,000 for the Dana Farber Cancer Center as part of the Oct. 6 Boston Athletic Association Half Marathon, he applied for a spot on the full marathon.

“I felt like this was a great way to lend my love of running and also my professional support to one of the best children’s hospitals in the world,” said Reynolds.

Before the Boston Marathon on April 17, Reynolds must raise $7,500. To make a donation online, visit www.miraclesformiles.org/boston and search for Reynolds’ name.