In article , Mort wrote:

Put your batteryless finger on your pulse at a wrist.

and then pull out a notebook to write it down.

are you going to do that every few minutes while exercising, then later
enter it into a spreadsheet to see how much you're exercising?

thought not.

Ludicrous is the nicest response that I can come up with. Why in the
world would any healthy person want to make a spread sheet with average
pulse rates?

many reasons, including tracking fitness progress as well as estimating
calorie burn.

looking to the future, additional sensors could monitor other vitals,
such as blood sugar. currently that requires a finger prick but there
is a lot of research into non-invasive methods. for someone with
diabetes, tracking blood sugar levels on a continuous basis could be a
life saver if it alerts them of something abnormal immediately rather
than when they notice they're about to pass out.

If there is a problem, then get a real portable recording
cardiac monitor.

it's to help *avoid* problems, not remedy them.