stevedownunder

This is exactly the reason I wear an Apple Watch now instead of a more expensive Swiss watch that was purchased several years earlier. 

I was very active at sports when younger but experienced some heart racing after decent gym one day which was unusual, it wasn't a heart attack and I felt ok but was concerned enough to look into it.
The racing kept happening It kept appearing so I bought the Apple Watch to monitor what was going on. The watch confirmed a suspicion and I saw it peak around 150bps, I saw a Dr, he put me on to beta blockers then I had an ablation surgery a couple months later.

The consultant said I'd lost 30% of the muscle strength in the heart by it racing over a short period of time and I probably would have had a stroke.

When I work out now I make sure I keep under 120bps to save any stress.

These watches literally save lives for a few hundred dollars.