This is the 387th most frequent Swedish word.
tränare
Coach.
The word 'tränare' here refers to a person who trains or coaches someone in a sport or skill.
Min tränare hjälpte mig att förbättra min teknik.
My coach helped me improve my technique.
In this context, 'tränare' is used to describe someone's profession or role as a coach.
Han arbetar som tränare för ett framgångsrikt fotbollslag.
He works as a coach for a successful soccer team.
'Tränaren' is definite here, referring specifically to a known coach in the conversation.