The watch's training benefit screen never shows anything except aerobic base when I finish a swimming session. It doesn't matter if I'm doing 400m reps @80-90% of max HR, or 50m sprints, or a slow recovery drills and skills session it always shows a training benefit of aerobic base.
I can guarantee that the 50m sprints are not aerobic, and the 400m reps are closer to that of a threshold session.
It's just a bit weird. Does anybody else experience this, and has anybody else managed to get another training benefit readout from a swim session?