Are you a Triathlete?
When asked, do you tsay your are "a Triathlete" (i.e. it's your life), or just that you "do Triathlons" (i.e. you have the time to do something else as well)
too much trifle
if you only do one then you have done 'A' triathlon, if you do them regularly you have the the right to call yourself a triathlete. i also do electrical work there fore i am a electrician. if you run, people will call you a runner.
thats not to say if you saw me doing a trithlon you could'nt call me a spanner, i have been called worse.