I am 40 so my maximum heart rate should be around 180. My resting heart rate is around 72 and I a reasonably fit although maybe a stone and a half overweight. Daily, outwith normal walking around, I usually jog half an hour, fast walk an hour and go on the exercise bike for half an hour. I got a Fitbit charge 3 last week and it tracks your heart rate, etc. I noticed that when pushing myself during the jogging and cycling thay my heart rate has got as high as 209. Google can’t seem to tell me if this is dangerous or not and I wondered what people’s thoughts are on here?