strength training,body battery and Intensity minutes

if you doing strength training,for example heavy deadlifts every 3-5 minutes or pull-ups 10 reps every 3-5 min or 10 dips for the same time and you doing this for 2 or 3 hours,the watch dont count or counts so few intensity minutes but your body had made a good strength training and you fill tired.I wonder if a smartwatch or a sportwatch can count the fatigue of your body,because fatigue doesn't come only by raising pulses,In this case, unfortunately, the fenix 6x cannot measure properly