I've started training again after 6 months. I'm 40 years old and averagely fit. I purchased a new health monitor that measures my heart rate 24/7.
I've been to the gym twice this week and during cardio training my heart rate is around 150-160. I'm fine with that, my heart rate recovers pretty quickly but after about an hour I've had heart rate spikes hitting around 180 on both occasions.
Should I be concerned, I've not actually felt my heart racing or anything like that. If it wasn't for the fitness tracker I wouldn't even know.
Any advice is welcome.