@GiPFELKiND the resources jumps (up and down) are discussed here quite often and they’re not really reliable when you look at them in short time intervalls, like a single day. In the long run, they pretty much fit my personal feeling. But afaik no one at Suunto can look deeper in how the resources work, since they are Firstbeat „stuff“. I found that I can raise them significantly (about +20% ) while meditating for 30 to 60 minutes and there my HR drops to sleeplike values, so my guess is, that sudden changes in HR will influence such highs in resources .