Those are the words of three-time major champion Stan Wawrinka, who sat down with ATP Uncovered for the latest edition of the ‘Note To Self’ series.

The former World No. 3 spoke on a variety of topics from his early days. The Swiss explained whether he enjoyed practice and fitness workouts as a junior, and revealed advice he would give to his younger self.

What trait does Wawrinka wish he would’ve had more of at the start of his career? Why was 2013 “a turning year” for him? Wawrinka leaves the episode by writing three important words on a whiteboard. Learn the answers to all that and more by watching the full video feature above.