I was terrified to discover my heart was FAILING at just 25 – my Apple watch detected the silent signs I totally missed

AVID gym-goer Niamh Cassidy claims her Apple watch "saved her life" when it detected she had heart failure at the age of 25. Up until then she had missed the signs of the condition, which can lead to sudden, life-threatening complications like sudden cardiac arrest. In the summer of 2023, Niamh decided to try the...