@OutriggerPaddleJunkie This is done by Garmin, not Suunto, which uses different algorithms for training analysis (TSS, CTL, ATL, TSB).
Suunto measures VO2max for things like running, but it’s not particularly relevant for analyzing training and various statistics. It might suggest physical fitness, but it’s only one metric, not necessarily the most important one – especially given that its accuracy is debatable.