Take the 2-minute tour ×  I've been running for about 10 months
now, started in January, when it was about -15 °C outside. Over
the time, I managed to lose about 15kg and improved my running a
lot, but I always come across the same problem.  I sometimes
tend to run too hard. For example, there are a lot of uphills on
my track, some of them are really steep. Sometimes I try to run
up as fast as I can until I get completely exhausted. But I'm
not just exhausted, I can feel my heart pumping so hard, I can
feel it on my chest, in my ears, just everywhere.  I don't have
a heart rate monitor, but I've been practicing with measuring it
on the neck, and I can on average say if it's 1.5, 2 or 3 beats
per second, which gives me a rough idea of my BPM. The problem
is, that when I stop, I sometimes feel like it's 3 beats per
second, or even more, which seems dangerous.  Is there any limit
where I should stop pushing myself to prevent some serious
injury? I've never been diagnosed with any heart problem, or
anything else