... my physical education teacher 'proposed me' (moze lepiej..made me/suggested to me) participation in the marathon.
...because 'I never was' lepiej 'I was never') a good runner.
He said that if I take part in 'this competitions' (albo l. poj - wtedy this competition, albo l. mnoga these competitions) I will get the highest mark for THE semester.
I prepared for these 'professions' (lepiej 'games') very conscientiously.
I 'had been running' (lepiej 'ran') every day in the morning before 'the' (bez the) school. After school I 'go' (WENT-czas przeszly) for about an hour'S work- out to the gym. I even used the special diet (tutaj mozna dodac..intended) for athletes..
When the 'marathon day' (mozna tez 'the day of the marathon') arrived...
As usuaL (nie usually) I got up in the morning, ate cornflakes FOR breakfast and listened to a few 'songs of Metallica' (Metallica songs). Then my father gave me a lift to the stadium where THE marathon race WAS TO take place.
...and how much effort I put into 'arrangements' (its preparation).
My competitors looked 'well sporty' (moze lepiej very sporty). I was terrified that I 'can run' (nie, lepiej 'would be') last.
I 'was concentrate' (albo 'was concentrating', albo 'concentrated') so much that I did not remember when I passED THE other runners. Suddenly I 'released' (nie, moze to literowka ale 'realized') that I 'ran' (mowimy 'came') first. I was very happy when I achieved THE gold medal. Now I know that 'the' (bez the) hard work is always profitable.