I track so many metrics! I’m trying to avoid overtraining. Also trying to decide if I can use blood glucose data to optimize meal timing. Watching my SpO2 and respiration rate for lung function. So many things.
I guess if you asked I’d recommend you think about what you’re trying to progress - why are you doing bodybuilding? Are you trying ultimately to change your body shape or your strength or something else? That’s what tells you what to track I guess …
Also, remember whatever you track has to be sustainable - it’s not super useful to start up tracking a ton of things then give up quickly, better to track only a few things but keep on doing it.