Locking to avoid duplicates Please use the search function before opening a new thread https://forum.suunto.com/topic/6952/define-2-cardiac-thresholds-which-make-the-watch-vibrating?_=1713453191840 And also, always ask your best friend first https://www.suunto.com/Support/Product-support/suunto_9_peak/suunto_9_peak/features/intensity-zones/