I was 43 and according to my £190 fitness tracker I was in perfect health... weeks later, I DIED from a heart attack and was brought back to life. I'm proof these gadgets CAN'T be relied on ⊕

'Fit and healthy' Julian Davies, 43, trusted his fitness tracker to flag any problems. Instead, it told him he'd had a 'great night's sleep' - as doctors diagnosed a major heart attack.