Jenny Simpson reveals rare heart condition caused her collapse; she will not return to running

World champion runner Jenny Simpson revealed it was a rare heart condition that threw her into cardiac arrest at a race in June and that she will not return to running. In an Instagram post Thursday, the 39-year-old Simpson said she was diagnosed with Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC), a condition that triggered “dangerous heart rhythms that ultimately caused my heart to stop.” Simpson was pacing a group of girls in a mile run at an event in Raleigh, North Carolina, whe...