Trainig status (body building)

Gianmarco R. said:

This is because the watch does not read the heart rate correctly and therefore does not calculate the workload correctly (at least I think so).

Consider using a HRM chest strap. The optical wrist-based HRM technology has its limits, especially when the blood flow through the veins under the watch is influenced by the workout. See also the article The Heart Rate Sensor on My Garmin Watch Is Not Accurate | Garmin Customer Support for some more details on that topic.

hello, thank you for your reply, I am familiar with the limitations of the sensor, but it seems absurd that I have to go to the gym with a chest strap while lifting weights. I was hoping that the watch would use an algorithm that would use a correction factor on trainig status/load, taking into consideration the sensor's own limitations.
I don't know if I have explained myself well but for example, with gym exercises where we have a lot of wrist utulization that surely compromises the reading, a corrective factor could be used that would give me a more likely heart rate and consequently a higher training load (now it is almost zero unfortunately).

Gianmarco R. said:

a corrective factor could be used that would give me a more likely heart rate and consequently a higher training load (now it is almost zero unfortunately)

What corrective factor exactly? At some people the HR is higher than the reality, at others lower, and there are also plenty of users who have no problems with the wrist HRM at strength workouts at all (myself including). So I am afraid that using a corrective factor is not really easily possible. If your watch gives wrong HR, then using the chest belt is the best advice I can give you. If you have an idea how to implement a universally functional corrective factor, suggest it to Garmin at Share Ideas | Garmin, they may be interested in it.

Alternatively, you could try attaching the watch to your ankle (use a strap extender if necessary), to see if it can detect your HR better during the workouts, if you do not want to use the chest belt. I do wear my watch on the ankle occasionally, and it works well for me.

The ankle thing I didn't know honestly.
For the corrective factor it doesn't have to be something fixed and unique for each person but it could be calculated according to certain parameters (maybe after some training in the gym and a series of targeted questions and answers about fatigue or loads used).
Surely Garmin with its developers knows a lot more about it than I do and maybe it is not even possible to develop and implement it.

For now, however, I am staying this way, I will try using the heart rate monitor and see if I have better results.

Anyway thanks, bye.

Gianmarco R. said:

it could be calculated according to certain parameters (maybe after some training in the gym and a series of targeted questions and answers about fatigue or loads used)

The variety of all possible exercises, their detection, and the way they can be performed more or less intensively, is so wide, that estimating the effort based on some predefined values would be even more inaccurate than with the inaccurate HR data. It would be utterly useless. Listen my advice and get a HRM chest strap, try the ankle, or try improving the HR reading of your watch as much as possible (some tips are in the article linked previously).