A "key personal attribute" is a measure of an important athlete characteristic that you want to keep track of over time. This can literally be anything—body fat percentage, joint range of motion, etc. FYTT lets you define whatever KPAs you want to track.
Every organization can create their own database of KPAs. Once you create a KPA, it will show up in the KPA section of the roster, where you can record measurements for individual athletes (see the Roster guide for more info on recording athlete KPA data). If you have an institution that manages multiple teams, you can create institution-level KPAs that are available to all teams (see the Institutions guide for more info).
KPAs are very simple and flexible. You need only provide a name, a unit (if applicable) and a format.
The name should be something descriptive and recognizable to anyone who might see it. Remember, FYTT is a collaborative platform, so make sure to use naming conventions that can easily be understood by others.
Providing a unit is optional. This field is freeform, so you can put whatever makes sense here. For example, if the KPA is for shoulder vertical flexion, it probably makes sense to put "degrees" as the unit.
There are three options for format: Decimal, Integer, and Percent. The decimal format will make sense for most metrics, but if you want to force whole numbers, you can select integer. For percentage measurements, like body fat percentage, select the percent option.