Just the arbitrary notion of how long it takes for an arbitrary number of grains of sand fall through an arbitrary opening at the bottom of an arbitrary bottle.
yes, but how do I compare my resting heartrate to someone else’s without someone borrowing someone else’s sandglass? Is 130 beats per glass high or low?
Minutes are a useful concept when I’m measuring my heartrate. Otherwise, I wouldn’t know how many beats per … something … I was hitting.
Put sand in a glass
Wait for it to drain
Congratulations you can now monitor your heart rate without arbitrary notions like “minutes”
Just the arbitrary notion of how long it takes for an arbitrary number of grains of sand fall through an arbitrary opening at the bottom of an arbitrary bottle.
The grains are real.
Your heartbeats are real.
Minutes are not.
yes, but how do I compare my resting heartrate to someone else’s without someone borrowing someone else’s sandglass? Is 130 beats per glass high or low?
A basis for comparison is very useful.
Use the same sand, duh
And it would be better to chase what feels best for you than some arbitrary mean