A Parkrun community raised funds for a replacement defibrillator in under 24 hours after the lifesaving kit was used on a collapsed runner.
A man taking part in the 5k event at Sloughbottom Park, Norwich, on 19 August was helped by volunteers and runners before paramedics arrived.
He is recovering, but the kit used on him needed to be replaced.
Race director Miranda Ellis said the response was “absolutely amazing”, with more than £1,000 pouring in.
The defibrillator is a requirement at all Parkruns, she added, and was used on the unconscious man soon into last Saturday’s run.