Sudden cardiac problems tend to rear their heads when you're overexerting yourself, no matter how healthy you perceive yourself to be[1]. There's a reason gyms have defibrillators, it's because strenuous exercise increases your risks of sudden cardiac events.

Here's an article from 2012, titled "Why do sports stars collapse in action?", that examines the collapse of athletes while playing sports[2]:

> Professional sports players are generally in prime physical condition, especially with today’s advanced physiological, nutritional and medical knowledge.

> However, Fabrice Muamba is the latest in a growing list of athletes around the world who have suffered heart problems – seemingly out of nowhere.

Weird how this sudden trend goes all the way back to 2012.

[1] https://health.clevelandclinic.org/can-too-much-extreme-exer...

[2] https://www.cnn.com/2012/03/19/sport/health-muamba-heart-pro...