Hi jedi00,
Welcome to the Apple Community, where some of us do our best to help each other.
Unfortunately, was unable to find precise answers to your questions.
Hopefully, others may post answers.
Amazed at the wealth of similar info. that is available online.
Perhaps there is something useful here.
Monitor your heart rate with Apple Watch
https://support.apple.com/en-us/HT204666
Check your heart rate on Apple Watch
https://support.apple.com/en-au/guide/watch/apda88aefe4c/watchos
Heart health notifications on your Apple Watch
https://support.apple.com/en-us/HT208931
The Apple Watch status icons
https://support.apple.com/en-au/guide/watch/apdce21b02a0/watchos
Status icons and symbols on Apple Watch:
https://support.apple.com/en-au/HT205550
Apple have a User Guide for Apple Watch online, that might prove useful.
Apple Watch User Guide:
(You might want to click on "Table of Contents" at the top or use the "Search")
https://support.apple.com/en-au/guide/watch/welcome/watchos
Apple support also have other articles that may help with the details of the workout app:
Eg:
Workout types on Apple Watch
https://support.apple.com/en-us/HT207934
Use the Workout app on your Apple Watch
https://support.apple.com/en-us/HT204523
A few more examples from the User Guide:
Check your heart rate on Apple Watch
https://support.apple.com/en-au/guide/watch/apda88aefe4c/watchos
Record an electrocardiogram with the ECG app on Apple Watch
https://support.apple.com/en-au/guide/watch/apdea4c50a57/watchos
Adjust the workout settings on Apple Watch
https://support.apple.com/en-au/guide/watch/apde0be691be/watchos
Cheers :)