I recommend using the Leadership Training dialog to track CPR training. First, go to Admin > Generic Lookups and select the Category of "Leadership Training". Add a new record like "CPR Training".
Now you can add this "CPR Training" record to all qualified Leaders. Either open the Leader's individual record, click the Leadership tab and then the Training History tab to enter a new record; or use the main Leaders module and select the Training History tab to add a new record from there.
[Note: in the Windows app, Generic Lookups are under Admin > System Settings.]