And the red face is really the least of it. After having that one beer, I didn't feel tipsy at all, but my heart rate doubled. My eyes were bloodshot, and within half hour I had a headache.
Harry's wandlight passed over shields and goblin-made helmets set on shelves rising to the ceiling; higher and higher he raised the beam, until suddenly it found an object that made his heart skip and his hand tremble.
" Well, " said Evie, " my daddy is a doctor. He makes sicky people better, and he listens to their hearts go 'boom, boom', and he has 14 pencils in a tub."
But, too much of it can make our hearts pump too quickly and our muscles contract uncontrollably, eventually leading to nausea, convulsions, heart attack, and even death.
And in the case of exercise, it's not just a matter of “working” or “not working” – in addition to keeping you healthy, getting your heartbeat elevated on a regular basis can also make you a better student.