beware, the tools you use show your level of competence
as an athlete or coach, strive to understand how resting physiology and metabolism work (as opposed to falling for marketing claims)
there is no point using a wearable if you want to use the data to capture your body’s ability to assimilate additional stress and to eventually guide training
wearables mostly tell you what you know already, as the data is tightly coupled to your eating and drinking behavior, and not much else