The heart of a New York teen made what his doctors are calling a miraculous comeback four days after it stopped beating at a gym. Daniel Walker, 17, has suffered from a rare congenital heart disease that has left his coronary artery pinched, giving him only 10 percent of normal heart capacity.

Walker was jogging at his high school gym when his flawed heart gave out on him. After days battling between life and death, doctors decided on a transplant.

Attached to a bypass machine to keep his blood pumping through the body, Walker was waiting for a heart transplant, that his rhythmless heart started beating again.

"It's a miracle," Dr. Abeel Mangi, one of Walker's cardiac surgeons at New York-Presbyterian Hospital Columbia, according to the AP. "There's really no other way to put it."

Walker's father called the incident a divine intervention. "God turned around, put His hand on my son, and recharged him," William Walker, 58, a retired sanitation worker, said, according to AP.

Walker's cardiac surgeons said they could not account for Walker's recovery, for not only his heart began beating of its own, its capacity to pump out blood also increased to 60 percent.

According to the doctors, it is probably the first such incident when a person with such heart condition has successfully revived.