Two comments:
i) I get that (negative W’bal) for myself, too, e.g., on the final sprint of races (or similar) once in a while (with W’ of 24 kJ, unfortunately, far away from any special jersey or alikes;-)
ii) Demonstrates, to me, a common i.icu problem: how do I zoom into the edges of an activity?
In fact, for this “Maglia Rosa” ride, the axis says W’bal goes down to -6 kJ, but I cannot move the cursor to any position where the “local” reading is <0:-o Not in the full display nor in any zoom into the final sprint I can achieve. Maybe I never get to the final datapoint where W’bal is depleted that far?
A general point related to this: It would in fact be great to be able to scroll left and right in any given zoom level in i.icu;-)
Great! Yes, zooming works now – in that it does not “wrap around” when you zoom over the edge.
However, at least, on my iPad I don’t get to the limit of MvdP’s W’bal minimum – zooming into the right end, by selecting a range going “over the edge” to the right, then moving the cursor all the way to the right, I only get this far: