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.

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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.

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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.

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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.