@Francesco-Pagano Just regarding the calculated thresholds - you should treat them like you would the trimp, epoc, vo2max etc for a run in that they are for that run. As the app says, if that run felt “normal” then the threshold suggestions can be used as an indication of your “normal” thresholds for setting HR zones but ZS is expected to fluctuate with stressors such as fatigue, illness, work/life stresses etc. on a daily basis.