World champion runner Jenny Simpson has announced she will not return to running due to a rare heart condition. The 39-year-old revealed her diagnosis with Arrhythmogenic Right Ventricular Cardiomyopathy, or ARVC, in an Instagram post. This condition led to cardiac arrest during a race in June.

Simpson shared the news on social media, providing some details about her condition. Further information about her diagnosis and decision to stop running can be found in her Instagram post.

The diagnosis of ARVC has brought an end to Simpson's running career, but the specifics of her condition and future plans are outlined in her social media statement.