Talk test still wins
If you can speak a sentence, you are probably in the aerobic easy range that builds a base. Use the watch as a double-check, not a commander.
When numbers help
People who always overdo enjoy a cap. People who never raise their heart rate enjoy a nudge.
- Easy days stay easy even if a friend is faster
- Hard intervals need a reason and a recovery plan
- Medicines like beta blockers change heart-rate interpretation — ask your clinician
Optical quirks
Cold weather, cadence lock on runs, and loose straps invent drama. If the number and your breathing disagree, believe breathing. A chest strap is for people who truly need cleaner sessions.
