What are the risks of heart failure while pushing yourself to the limit if you're unfit? I've seen many deaths from people at local training grounds who's heart suddenly stopped - and every case I've seen has been from people in their 20s or younger.
I've never been much of an athlete, but in searching for hobbies I've discovered a newfound nack for running. I did 10km the other day and felt fine. I want to up it to 15 or 20 km soon. I'm generally healthy, mid 20s but kind of unfit. My heart rate is fairly high on average (85+), and when working out my watch measured it at around 190! I just want to make sure I'm not pushing myself beyond sensible limits or should be worried about heart issues…
You can't be that unfit if you ran 10kms. You'll be fine, just keep at it, and your resting heart rate and peak heart rate will lower.