London Marathon: Don't Die. How ECG Monitoring Saves Runners' Lives. Cardiac arrest strikes roughly one in 100,000 marathon finishers, and that rate has not fallen in 23 years. An ECG chest strap monitors the electrical signals your GPS watch cannot see. Here is how to...

Cardiac arrest hits 1 in 100,000 marathon finishers. The rate hasn't changed in 23 years. Your GPS watch can't see the warning signs. An ECG strap can. the5krunner.com/2026/03/31/e... #LondonMarathon #FourthFrontierX2 #ECG #Running