By Walt Hunter

PHILADELPHIA (CBS) — Dr. Paul Shore quickly went from runner to lifesaver as he helped revive a fellow runner, stricken with heart problems, during Sunday’s Broad Street Run.

READ MORE: Several People Injured After Tree Falls During West Philadelphia High School Reunion Party At Fairmount Park

In an exclusive interview with CBS 3’s Walt Hunter, Dr. Shore explained how he was waved down by frantic racers and bystanders after a 33-year-old runner dropped to the ground unconscious with a heart problem near Broad and Lehigh, about three miles into the race.

Exclusive FBI video obtained by CBS 3, shows the doctor performing CPR on the runner, as a team of nurses passing by assist him.

As they worked, and as CBS 3 first reported Monday, Philadelphia Police Officer Matt Fleming, and a specially trained team of three FBI agents were also racing to the scene with a defibrillator.

READ MORE: Man Struck, Killed By Vehicle In Northeast Philadelphia: Police

Doctor Shore, a pediatric intensive care specialist, told Hunter he was “amazed” that a group of “total strangers” could come together in a moment to help save a life, the runner now in “good condition”.

The doctor and his wife, Lee Ann, a CPR instructor, say they hope the doctor’s actions carry a much wider and lifesaving message: everyone should learn CPR.

Dr. Shore explained this was the fourth time had  used CPR helping to save a life, most recently coming to the rescue of a fellow runner who had collapsed in the 2013 Philadelphia Marathon.

MORE NEWS: Philadelphia Weather: Week Starts With Muggy Conditions Before Cold Front Arrives

The couple explained you never know when or where this lifesaving skill will be needed, so its important everyone invest the small amount of money and time that makes such a big difference saving lives.