Add the option to create a custom metric
Currently when tracking metrics for athletes or oneself, you must choose from a preset selection of options, which obviously does not include every possible concern. When coaching athletes with less common concerns, it would be very useful to be able to add a custom metric so that one could track that specific symptom without having to write a note about it each time. One example of this would be migraine headache. Another would be an athlete with intermittent chronotropic incompetence, or HR issues related to intermittent beta blocker usage, for example for arrhythmia or performance anxiety. Adding every foreseeable medical issue is unrealistic, but allowing the coach/athlete to customize a metric to their needs would be highly useful
