Once excluded it should only ever have to be done once (unless a software update/patch wipes them out) and if it does flag one of the other trainers, look in the QUARANTINE folder of the anti-virus it should give you the name of the suspected file, just add it to exclusions and clear the quarantine folder before running it again. As for live scanning, it should ignore the exclusion list but depending on what software maker it is, you would best find that out on their support site for you particular version of the software. So many out there and they all have their own little quirks which make our lives oh so much more wonderful
endurance declines on and on.. so your stamina goes to the max endurance.
for instance your max stamina is 100 at the beginning of the game, but as the game progresses, your max stamina will drop as the endurance drops. for some players, the max stamina might be 70 by the time the game ends.. or even less.
stamina drops quickly as you use it during the play. endurance is the max stamina available at each play and drops during the whole game.