Is a resting heart rate of 55 BPM dangerous for a 19-year-old? Should I be concerned about this? I'm not particularly active but I've started exercising and got a Fitbit which is
![What If Your Overnight Heart Rate Has Nothing To Do With Your Cardiovascular Fitness | by James McCarter | Medium What If Your Overnight Heart Rate Has Nothing To Do With Your Cardiovascular Fitness | by James McCarter | Medium](https://miro.medium.com/max/1400/1*2AGZsoS9PQJmSlMQUIlzZg.png)
What If Your Overnight Heart Rate Has Nothing To Do With Your Cardiovascular Fitness | by James McCarter | Medium
![The Blood Pressure Champion 🇺🇸 on Twitter: "While mere mortals have a resting heart rate (RHR) of 60 to 80 beats per minute (bpm), world class athletes like sprinter Usain Bolt and The Blood Pressure Champion 🇺🇸 on Twitter: "While mere mortals have a resting heart rate (RHR) of 60 to 80 beats per minute (bpm), world class athletes like sprinter Usain Bolt and](https://pbs.twimg.com/media/Eap3BRJXgAAmyjY.jpg:large)
The Blood Pressure Champion 🇺🇸 on Twitter: "While mere mortals have a resting heart rate (RHR) of 60 to 80 beats per minute (bpm), world class athletes like sprinter Usain Bolt and
![Usain Bolt talks running, speed, his body, fame and selfies ahead of the 2016 olympics | British GQ | British GQ Usain Bolt talks running, speed, his body, fame and selfies ahead of the 2016 olympics | British GQ | British GQ](https://media.gq-magazine.co.uk/photos/5d139b19003d753872ae65b5/2:3/w_852,h_1278,c_limit/usain-bolt-3-gq-2aug16-pr_b.jpg)
Usain Bolt talks running, speed, his body, fame and selfies ahead of the 2016 olympics | British GQ | British GQ
![Intermittent fasting has brought my resting heart rate way down and you can even see where I had a wider window for Christmas! : r/fasting Intermittent fasting has brought my resting heart rate way down and you can even see where I had a wider window for Christmas! : r/fasting](https://preview.redd.it/intermittent-fasting-has-brought-my-resting-heart-rate-way-v0-zzgwo4dgi5981.jpg?width=640&crop=smart&auto=webp&s=57499ed34bc65fe78e5442c884f0989cfaafb7e5)
Intermittent fasting has brought my resting heart rate way down and you can even see where I had a wider window for Christmas! : r/fasting
![Is Usain Bolt really one of the greatest sportsman of all time? Here are 13 alternatives to choose from - Daily Record Is Usain Bolt really one of the greatest sportsman of all time? Here are 13 alternatives to choose from - Daily Record](https://i2-prod.mirror.co.uk/incoming/article8633052.ece/ALTERNATES/s1200c/Mens-Olympic-100m.jpg)