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A PR is any all-time best the system auto-detects from your log — a top load, rep count, estimated 1RM, distance, or fastest time.
A personal record (PR / PB) is the best value you have logged for a given metric and context. For strength the data layer should track several PR types per exercise:
For cardio: fastest time over a distance, longest distance, best average pace/power (see cardio-pace), highest FTP.
Design notes for the app:
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.